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Sinogram

''Sinogram'' is a term with meanings in multiple fields. In linguistics, a sinogram is a logographic character used in Chinese writing (''hanzi'') and related scripts in languages such as Japanese (''kanji'') and Korean (''hanja''). For more details, see § Sinogram in Linguistics. In radiology, a sinogram is a fluoroscopic X-ray procedure using contrast medium to visualize an abnormal tract or cavity, such as a sinus or fistula, connecting to the skin surface.^[1] For more details, see § Sinogram in Radiology. In computed tomography (CT), a sinogram is a two-dimensional representation of raw projection data from X-ray scans at various angles, derived from the Radon transform and used as input for image reconstruction algorithms. For more details, see § Sinogram in Computed Tomography.

Sinogram in Linguistics

Definition and Etymology

A sinogram is a logographic character used in the Chinese writing system, functioning as a graphic symbol that represents a morpheme, word, or idea rather than a phonetic sound.^[2] Unlike alphabetic scripts, which encode speech through sequences of sounds, sinograms convey meaning directly through visual form, enabling their adaptation across multiple East Asian languages such as Chinese, Japanese (as kanji), and Korean (as hanja).^[2] This logographic nature distinguishes sinograms as a core element of Sinographic writing systems, which prioritize semantic and morphological representation over phonology.^[3] The term "sinogram" derives from the French "sinogramme," a compound formed from the prefix "sino-" (relating to China, from Latin Sinae) and "gramme" (pertaining to writing or drawing, from Greek gramma).^[4] Coined in the 19th century amid growing European interest in Asian linguistics, "sinogramme" was introduced to specifically denote characters from the Chinese script and related Sino-Tibetan language systems, providing a neutral descriptor for these non-alphabetic symbols.^[4] The English adaptation "sinogram" appeared shortly thereafter, with its earliest recorded use in 1859 within the New American Cyclopaedia, reflecting the era's scholarly efforts to catalog and analyze Eastern writing systems.^[3] The concept of sinograms emerged within the broader context of European Sinology during the 18th and 19th centuries, when scholars sought to differentiate logographic scripts from the phonetic alphabets dominant in Western languages.^[5] Pioneering works, such as those by French sinologist Joseph de Guignes in the 1750s, examined the structure and antiquity of Chinese characters, laying groundwork for later terminological developments even though the specific term "sinogram" solidified only in the following century.^[5] This period marked a shift toward systematic study of Chinese writing as a distinct linguistic tradition, influencing modern understandings of logography in global linguistics.^[2]

Structural Characteristics

Sinograms, also known as Chinese characters, are composed of distinct components that contribute to their meaning and pronunciation. A key element is the radical, a semantic classifier that often indicates the character's category or meaning, such as 氵 (radical for water-related terms). These radicals, numbering around 200 in traditional classification systems, typically appear on the left or top of the character. Complementing the radical is the phonetic component, which provides a clue to the pronunciation, though not always exact due to historical sound changes; together, these form the majority of sinograms. The total number of strokes—basic line segments used in writing—varies widely, ranging from a single horizontal stroke in 一 (yī, meaning "one") to over 30 in complex, rare characters like 龘 (dá, an onomatopoeic term for dragon flight).^[6]/01:_Introduction-_The_Basics_of_Chinese/1.04:_Chinese_Characters) Sinograms are categorized into several formation types based on their origins and construction methods. Pictographic sinograms, the earliest type, visually resemble the objects or concepts they represent, such as 山 (shān, "mountain") derived from a drawing of peaks. Ideographic sinograms convey abstract ideas through symbolic combinations, like 上 (shàng, "above") formed by a line over a horizontal base. The most prevalent type is phono-semantic compounds, where a semantic radical pairs with a phonetic element to suggest both meaning and sound; these account for approximately 80% of modern sinograms.^[7]^[8] The structure of sinograms has evolved significantly over millennia, reflecting changes in writing tools, societal needs, and standardization efforts. The earliest known form, oracle bone script, dates to around 1200 BCE during the Shang Dynasty, featuring incised inscriptions on animal bones and turtle shells for divination purposes; these were highly pictorial and irregular in style. Subsequent developments included bronze script and seal script, leading to more standardized forms by the Han Dynasty (c. 200 BCE–200 CE). In 1956, the People's Republic of China introduced simplified sinograms through an official scheme to reduce stroke counts and promote literacy, affecting thousands of characters while preserving traditional forms in regions like Taiwan and Hong Kong. Modern digital representation is facilitated by Unicode standards, particularly the CJK Unified Ideographs block, which encodes over 90,000 sinograms to support compatibility across East Asian languages.^[9]^[10]^[11]

Usage Across Languages

Sinograms, known as Chinese characters or hanzi, constitute the foundational writing system for Mandarin Chinese and other Sinitic dialects spoken across China, Taiwan, and Chinese communities worldwide. Comprehensive dictionaries, such as the Kangxi Zidian compiled in 1716, catalog approximately 47,035 characters, encompassing historical, variant, and rare forms used over millennia.^[12] In contemporary usage, the Table of General Standard Chinese Characters, promulgated by China's State Language Commission in 2013, standardizes 8,105 characters for official purposes, reflecting the streamlined set employed in modern simplified script. For practical literacy in everyday reading—such as newspapers, signs, and basic literature—proficiency in 2,000 to 3,000 commonly used characters suffices, enabling comprehension of over 99% of typical texts.^[13]^[14] These characters have been adapted across East Asian languages, demonstrating their versatility while accommodating linguistic differences. In Japanese, sinograms evolved into kanji during the 5th to 9th centuries, retaining semantic meanings from Chinese but incorporating phonetic simplifications; for instance, hiragana and katakana syllabaries are often added alongside kanji to clarify pronunciation, addressing Japanese's distinct phonological structure.^[15] Korean adopted sinograms as hanja from the 2nd century onward for classical literature and official documents, but following the invention of Hangul in 1446 by King Sejong, hanja's role diminished; by the mid-20th century, Hangul had supplanted hanja as the primary script in both North and South Korea, confining hanja to academic, legal, and occasional name usage.^[16] Similarly, Vietnamese employed sinograms as chữ Hán for over a millennium until the early 20th century, when colonial influences and literacy reforms promoted the Latin-based Quốc ngữ script, leading to chữ Hán's near-complete obsolescence in daily and official contexts by the 1940s.^[17] In the digital era, sinograms face challenges in input and standardization, addressed through innovative technologies and global protocols. Input methods like Pinyin conversion—where users type romanized phonetic representations (e.g., "ni hao" for "你好") and select from candidate characters—dominate, with systems such as Microsoft's Simplified Chinese IME supporting efficient typing on keyboards and touch devices across platforms.^[18] These tools mitigate the complexity of memorizing thousands of characters, enhancing accessibility for native speakers and learners alike. Furthermore, sinograms are integral to ISO/IEC 10646, the international standard for the Universal Coded Character Set underpinning Unicode, which unifies CJK (Chinese-Japanese-Korean) ideographs in a single repertoire of over 90,000 characters, facilitating seamless cross-language compatibility in computing, web content, and data exchange.

Sinogram in Radiology

Definition and Purpose

A sinogram is a fluoroscopic X-ray examination that employs radiopaque contrast media to visualize a sinus tract, which is defined as a blind-ending abnormal channel or passage extending from an internal body cavity or organ to the skin surface, typically arising from infection, inflammation, trauma, or surgical complications.^[1]^[19] This real-time imaging technique allows for dynamic assessment under fluoroscopy, enabling the radiologist to observe the flow of contrast as it fills the tract.^[20] The primary purpose of a sinogram is to delineate the anatomical extent of the sinus tract, including its length, depth, branching patterns, and potential connections to deeper structures such as bone, organs, or abscess cavities, thereby aiding in accurate diagnosis and treatment planning.^[19]^[21] Unlike a fistulogram, which evaluates fistulas—abnormal passages with two external openings connecting two epithelialized surfaces—a sinogram specifically targets these blind-pouch tracts to guide interventions like surgical debridement or drainage.^[1]^[22] This differentiation is crucial for determining the underlying pathology and preventing complications such as recurrent infections.^[23]

Procedure Details

The sinogram procedure begins with thorough preparation to ensure patient safety and procedural accuracy. The patient is positioned on a fluoroscopic table to optimize visualization of the sinus opening, typically in a supine or oblique orientation depending on the tract's location. The skin surrounding the external opening is antiseptically cleaned and dried, and a radiopaque marker may be placed nearby for reference during imaging. Local anesthesia is administered via injection to numb the area, minimizing discomfort during catheter insertion. A small, flexible catheter or blunt probe is then carefully inserted into the sinus opening under fluoroscopic guidance to access the tract without causing trauma.^[24]^[1]^[25] Following preparation, contrast injection is performed to fill the sinus tract retrogradely. A small amount of water-soluble iodinated contrast medium, adjusted based on tract size, is injected slowly through the catheter using gentle pressure to avoid rupture or perforation. Real-time fluoroscopy monitors the contrast flow, allowing identification of tract endpoints, branching, leaks, or connections to adjacent structures as the medium opacifies the pathway. Spot radiographs or dynamic video sequences are captured intermittently to document the filling process and any abnormalities observed. This step aligns with the procedure's diagnostic goal of delineating sinus anatomy for targeted evaluation.^[24]^[1]^[26] Post-procedure care focuses on immediate recovery and complication prevention. The catheter is removed once adequate imaging is obtained, and the insertion site is cleaned and covered with a sterile dressing to reduce infection risk. Patients are monitored for signs of adverse reactions, such as bleeding, swelling, allergic responses to contrast, or infection, with instructions to report fever or increased discharge. Images, including static radiographs and fluoroscopic videos, are archived digitally for subsequent analysis by the radiologist. The entire procedure typically lasts 15-30 minutes, allowing most patients to resume normal activities shortly thereafter, though strenuous efforts may be restricted for 24 hours.^[1]^[26]^[25]

Clinical Applications and Limitations

Sinograms play a crucial role in the diagnosis of osteomyelitis, particularly in cases involving chronic or fistulating infections where sinus tracts are present, by visualizing the extent and communication of these tracts with underlying bone structures.^[21] This imaging modality is especially valuable in resource-limited settings where advanced techniques like MRI or CT may be unavailable, allowing clinicians to confirm bone involvement and guide subsequent management.^[21] In orthopedic practice, sinograms are commonly employed for assessing deep infections, such as those following trauma or surgery, where they help delineate infection pathways that plain radiographs cannot fully resolve.^[27] Beyond diagnosis, sinograms aid in planning abscess drainage procedures by mapping the precise course of sinus tracts and identifying potential communications with abscesses or soft tissues, thereby informing percutaneous or surgical interventions.^[28] They also support post-trauma or postoperative wound assessments by revealing persistent tracts that may indicate ongoing infection, facilitating targeted debridement or biopsy guidance.^[27] For instance, a 2023 case report from the National Institutes of Health described a 25-year-old male with a discharging heel ulcer and suspected calcaneal osteomyelitis; the sinogram demonstrated a tract extending from the skin to the calcaneus, confirming the diagnosis and enabling effective antibiotic therapy combined with debridement.^[21] Studies highlight sinograms' reliability in tract delineation when correlated with clinical and microbiological findings, though they are often complemented by bone biopsy for definitive pathogen identification.^[28] Despite their utility, sinograms have notable limitations that must be considered in clinical decision-making. The procedure carries a rare risk of allergic reactions to the injected contrast medium, with nonionic contrasts generally safer but still requiring premedication in at-risk patients.^[1] Additionally, improper technique can potentially spread infection along the tract, emphasizing the need for strict sterile conditions.^[1] Sinograms are less suitable for deep or complex tracts without adjunctive ultrasound or fluoroscopic guidance, as visualization may be obscured, and they provide inferior soft-tissue detail compared to MRI.^[21] Radiation exposure from the fluoroscopy involved is typically low but should be minimized, especially in patients requiring repeated imaging.^[29] Overall, while effective for targeted applications, sinograms are best integrated into a multimodal diagnostic approach to mitigate these constraints.^[21]

Sinogram in Computed Tomography

Definition and Data Representation

In computed tomography (CT), a sinogram is a two-dimensional dataset comprising the line integrals of X-ray attenuation coefficients through an object, measured along rays at various projection angles, which collectively form the raw input for tomographic image reconstruction. This representation captures the projections P(θ, t), where θ denotes the projection angle and t the perpendicular distance from the rotation center to the ray path, encoding the object's density distribution in a compact form prior to inversion.^[30] The sinogram is structured as a matrix, with rows corresponding to detector positions t (radial distances across the detector array, typically spanning the object's diameter) and columns to discrete projection angles θ (incremented in steps, often over 0° to 180° for parallel projections or 0° to 360° in full rotations to account for redundancy). When visualized as an image plot—with intensity levels reflecting attenuation values—the sinogram reveals prominent sinusoidal patterns, arising from the cyclic geometry of the rotating X-ray source and detectors relative to fixed points in the object.^[31] Sinogram data are acquired during the CT scanner's gantry rotation, employing either parallel-beam geometry—where rays are parallel within each projection and collected via linear source-detector motion—or fan-beam geometry, utilizing a diverging fan of rays from a focal spot source to an arc-shaped detector array for efficient coverage. In parallel-beam acquisition, projections fill the sinogram uniformly across angles, while fan-beam setups produce curved trajectories in the data space that may require rebinning to parallel format for processing.^[30] For instance, projections from an isolated point source at a radial offset r from the center trace a pure sine wave in the sinogram, given by t = r \sin(θ - \phi) where \phi is the point's angular position, repeating every 180° with inverted polarity.^[31] These sinograms provide the foundational dataset for subsequent reconstruction processes, such as filtered backprojection, to yield the final cross-sectional image.^[30]

Mathematical Foundations

The sinogram in computed tomography represents the data acquired through the Radon transform, a mathematical operator that maps a two-dimensional function to its line integrals along specified directions.^[32] Formally, for a 2D attenuation function f(x, y) representing the object's density distribution, the sinogram S(\theta, t) at angle \theta and perpendicular distance t from the origin is defined as

S(\theta, t) = \int_{-\infty}^{\infty} \int_{-\infty}^{\infty} f(x, y) \, \delta(x \cos \theta + y \sin \theta - t) \, dx \, dy,

where \delta is the Dirac delta function, ensuring integration occurs along the line x \cos \theta + y \sin \theta = t.^[32] This integral captures the cumulative attenuation along rays at angle \theta, with t parameterizing the radial offset, forming the foundational projection data for tomographic reconstruction.^[33] The Radon transform exhibits key properties that underpin its utility in imaging. It is linear, meaning S(\theta, t) of a linear combination a f_1(x, y) + b f_2(x, y) equals a S_1(\theta, t) + b S_2(\theta, t), facilitating superposition of signals.^[32] Under conditions such as compact support or band-limited smoothness of f(x, y), the transform is invertible, allowing recovery of the original function via filtered backprojection or other methods.^[33] The Fourier slice theorem further connects the sinogram to the frequency domain: the one-dimensional Fourier transform of S(\theta, \cdot) at radial frequency \omega yields values along the line at angle \theta in the two-dimensional Fourier transform of f(x, y), enabling efficient frequency-space interpolation for reconstruction.^[34] The Radon transform was introduced by Johann Radon in his 1917 paper, where he derived the integral formulation and its inversion for functions defined on manifolds, motivated by problems in potential theory rather than imaging. Its application to computed tomography emerged in the 1960s through Allan Cormack's theoretical work on X-ray attenuation and reconstruction algorithms, and Godfrey Hounsfield's engineering of practical scanners in the early 1970s.^[35] For these contributions to CT development, Cormack and Hounsfield shared the 1979 Nobel Prize in Physiology or Medicine.^[35]

Role in Image Reconstruction

In computed tomography (CT), sinograms serve as the foundational data structure for image reconstruction, where projections collected at various angles are processed to recover the original cross-sectional image. The filtered backprojection (FBP) method is a classical analytical approach that applies a ramp filter to the sinogram projections to compensate for the blurring introduced by backprojection, followed by summing the filtered projections across all angles to form the image.^[36] This technique, widely adopted for its computational efficiency, directly operates on the sinogram to produce high-resolution images under ideal conditions with complete and noise-free data.^[36] For scenarios involving noisy or incomplete sinograms, iterative reconstruction techniques offer superior performance by modeling the imaging physics and incorporating statistical priors. Algebraic Reconstruction Technique (ART) iteratively updates the image estimate by projecting rays through the current image and adjusting based on discrepancies with the measured sinogram, converging to a solution that minimizes errors.^[37] Similarly, Simultaneous Iterative Reconstruction Technique (SIRT) performs updates across all projections simultaneously in each iteration, providing stable convergence and effective noise suppression in low-dose CT applications.^[37] These methods excel in handling inconsistencies in the sinogram, such as those from sparse views, yielding images with reduced artifacts compared to FBP. Practical processing of sinograms often includes preprocessing steps to adapt data formats and mitigate artifacts. In fan-beam CT systems, sinogram interpolation converts divergent fan-beam projections to parallel-beam equivalents, enabling the application of standard parallel-beam reconstruction algorithms and improving uniformity in the reconstructed image.^[38] Artifacts like streaking from metal implants, which manifest as inconsistent traces in the sinogram, are addressed through sinogram editing techniques, such as total variation inpainting, that replace corrupted projection values while preserving underlying anatomical structure.^[39] Recent advancements leverage deep learning to enhance sinogram-based reconstruction, enabling faster processing and dose reduction. Models like iCT-Net process sinograms directly through convolutional layers that emulate filtering and backprojection, achieving accurate reconstructions from sparse or noisy data with up to 50% fewer projections than traditional methods.^[40] As of 2025, further progress includes diffusion models for sinogram inpainting in limited-angle CT and transformer-based networks like SwinIR for sinogram and image enhancement in cone-beam geometries, improving low-dose imaging quality and enabling applications in dynamic and spectral CT.^[41]^[42] These neural networks integrate with AI frameworks for downstream tasks, such as automated abnormality detection in reconstructed images, further streamlining clinical workflows.

References

[1]
How Does CT Reconstruction Work? - Rigaku
Jan 11, 2023 · What is a sinogram? · A normal sinogram shows a collection of smooth sine curves. · Vertical lines that are darker or lighter than the surrounding ...
[2]
Sinogram Interpolation Inspired by Single-Image Super Resolution
Computed tomography is a medical imaging procedure used to estimate the interior of a patient or an object. Radiation scans are taken at regularly spaced angles ...
[3]
https://www.oed.com/dictionary/sinogram_n1
[4]
sinogram, n.¹ meanings, etymology and more | Oxford English ...
There is one meaning in OED's entry for the noun sinogram. See 'Meaning & use' for definition, usage, and quotation evidence. See meaning & use. How common ...
[5]
Définition de sinogramme | Dictionnaire français - La langue française
Apr 24, 2024 · Du latin sinogrammatum. Dérivé de gramme (« relatif à l'écriture »), avec le préfixe sino- (« relatif à la Chine »). Usage du mot « sinogramme ».
[6]
Fusang: The Enlightenment Story of the Chinese Discovery of America
Abstract: In 1761 the French scholar and Sinologue Joseph de Guignes an nounced that “Chinese vessels made the voyage to America many centuries.
[7]
Radicals and components of Characters
Traditionally, Chinese characters are grouped according to their shared components known as “radicals(部首, bùshǒu)”. There are about 200 radicals(部首, bùshǒu) ...
[8]
The Six Types of Chinese Characters
Oct 29, 2024 · Knowing common phonetic components and radicals can make it easier to guess both the meaning and pronunciation of Chinese characters.
[9]
Phonetic components, part 1: The key to 80% of all Chinese characters
Aug 30, 2013 · At least 80% of all Chinese characters are made up of one semantic component (meaning) and one phonetic component (pronunciation).
[10]
Oracle Bone Script (甲骨文)
Oracle-bone script (jiaguwen), the earliest known form of systematic Chinese writing, dates from the fourteenth to eleventh century BCE.
[11]
More Than You Want to Know About Simplified Characters
Sep 24, 2021 · Even though many characters were not changed, the total official writing system is usually called "simplified characters" (jiǎntǐzì 簡體字 / ...
[12]
Unicode 17.0.0
Sep 9, 2025 · CJK/Unihan Changes. The new CJK Unified Ideographs Extension J block with 4,298 ideographs pushes the number of CJK ideographs to over 100,000.
[13]
Kangxi zidian 康熙字典(www.chinaknowledge.de)
... characters are arranged according to the residual stroke number left after subtracting the radical. The Kangxi zidian contains 47,035 characters in total ...
[14]
https://www.mandarinblueprint.com/blog/chinese-characters/
[15]
Understanding Chinese Characters: the Basics You Need to Know
Full literacy in Chinese writing requires knowing between 3 and 4 thousand of the most common characters. Characters beyond this level are rarely used in ...
[16]
Why Does Japanese Use Chinese Characters (Kanji)?
Jul 31, 2019 · Kanji was adapted from traditional Chinese characters from the 5th century C.E., which some may argue are more aesthetically pleasing than ...
[17]
The Hangul Revolution: How The Creation of A Written Language ...
Oct 12, 2016 · It was created in 1443 by the fourth king of the Joseon Dynasty, Sejong the Great, to replace the Chinese characters, or hanja, that had been used exclusively ...
[18]
Why Did Vietnam Adopt The Latin Alphabet? - Vietcetera
Sep 30, 2024 · Vietnam's adoption of the Latin alphabet was a gradual process influenced by a mix of practical, religious, and political factors.
[19]
Simplified Chinese IME - Globalization | Microsoft Learn
Jun 20, 2024 · The Microsoft Pinyin Input Method Editor and the Microsoft Wubi Input Method Editor (IME) for Windows lets you enter text using Simplified Chinese characters.
[20]
Fistulogram-sinogram - Radiologyinfo.org
Similarly, a sinogram assesses an abnormal passage called a sinus that originates or ends in one opening, often on the skin.
[21]
Sinus tract | Radiology Reference Article | Radiopaedia.org
Mar 6, 2022 · Direct visualization of the sinus tract, its ramifications, and extent can be done using radiopaque contrast material under fluoroscopic ...
[22]
Branchial Cleft Anomalies - StatPearls - NCBI Bookshelf - NIH
May 27, 2025 · If a sinus tract is present, a sinogram can be obtained by injecting radiopaque dye to delineate the course and determine the size of the cyst.
[23]
Sinogram: A Valuable Diagnostic Tool for an Adult Male With ... - NIH
Aug 17, 2023 · Sinogram imaging offers a cost-effective alternative to diagnosing osteomyelitis. It has proven to be a valuable diagnostic tool, providing ...<|control11|><|separator|>
[24]
Fistulas and sinus tracts: Radiographic evaluation, management ...
Despite the newer imaging modalities, a sinogram or a fistulogram is still the best means of evaluating a sinus tract or fistula when an external communication ...Missing: definition | Show results with:definition
[25]
Fistulas and sinus tracts: radiographic evaluation, management, and ...
Despite the newer imaging modalities, a sinogram or a fistulogram is still the best means of evaluating a sinus tract or fistula when an external communication ...Missing: radiology definition
[26]
[PDF] History of Contrast Media - Journal of Clinical Practice and Research
Jun 1, 2021 · “The history of contrast media has been intertwined with that of radiology since its inception,” said Jean-François Moreau (1), a professor of ...
[27]
Historical Perspective of Imaging Contrast Agents - PubMed
Contrast agents were introduced early in the history of medical imaging. Iodine-based intravascular agents became the radiographic compounds of choice.
[28]
Fluoroscopic fistulogram | Radiology Reference Article
Mar 12, 2025 · Fluoroscopic fistulograms/sinograms are used to characterize fistulas and sinus tracts by injecting iodinated contrast media directly into an external ...
[29]
A Patient's Guide to Having a Sinogram
Jul 7, 2025 · A Sinogram is a procedure that uses low dose radiation to guide a needle into the exact area where the contrast is needed.
[30]
None
### Summary of Sinogram Procedure
[31]
Chronic osteomyelitis: role of sinography. (A) Anteroposterior view of...
Sinography may be combined with CT for better delineation of the sinus tracts. Figure 1 shows sinography in a patient with chronic osteomyelitis. CT provides ...
[32]
Radiographic Imaging in Osteomyelitis: The Role of Plain ...
Retrograde injection of contrast material defines the course and extent of the sinus tract and its possible communications with neighboring structures.Missing: sinogram | Show results with:sinogram
[33]
Radiation Dose from X-Ray and CT Exams - Radiologyinfo.org
To put it simply, the amount of radiation from one adult chest x-ray (0.1 mSv) is about the same as 10 days of natural background radiation that we are all ...Missing: sinogram | Show results with:sinogram
[34]
[PDF] CT Image Reconstruction - AAPM
Another concept that is useful to use when considering CT reconstruction is the “Sinogram”, which is simply the 2-D array of data containing the projections.
[35]
Filtered BackProjection (FBP) Illustrated Guide For Radiologic ...
Nov 23, 2020 · The CT data is called a sinogram, because each point in the image traces out a sinusoid (i.e. a cosine curve). How do you do a filtered ...
[36]
Radon Transform -- from Wolfram MathWorld
The Radon transform is an integral transform whose inverse is used to reconstruct images from medical CT scans.
[37]
Radon Transform - an overview | ScienceDirect Topics
The Radon transform is defined as a mathematical operation that maps a function into a new representation by integrating it along a family of equispaced ...Introduction to the Radon... · Role in Medical Imaging and...
[38]
Slice Theorem - an overview | ScienceDirect Topics
Fourier- or Radon-type reconstruction follows from the Fourier slice theorem, which demonstrates that the 1D Fourier transform of projections of g corresponds ...
[39]
The Nobel Prize in Physiology or Medicine 1979 - NobelPrize.org
The Nobel Prize in Physiology or Medicine 1979 was awarded jointly to Allan M. Cormack and Godfrey N. Hounsfield for the development of computer assisted ...Missing: Radon transform
[40]
The evolution of image reconstruction for CT—from filtered back ...
Oct 30, 2018 · Due to lack of computational power, this technique was quickly replaced by simple analytic methods such as filtered back projection (FBP). FBP ...
[41]
Improved Compressed Sensing-Based Algorithm for Sparse-View ...
Both the ART and SIR methods solve the reconstruction problem iteratively. Iterative algorithms have been proven to be advantageous over analytical ...
[42]
https://ieeexplore.ieee.org/document/11097904
[43]
https://ieeexplore.ieee.org/document/4774201
[44]
https://ieeexplore.ieee.org/document/8688568