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2 edition of Photon beam dose calculations in regions of tissue heterogeneity using computed tomography. found in the catalog.

Photon beam dose calculations in regions of tissue heterogeneity using computed tomography.

Marc R. Sontag

Photon beam dose calculations in regions of tissue heterogeneity using computed tomography.

by Marc R. Sontag

  • 312 Want to read
  • 7 Currently reading

Published .
Written in English


The Physical Object
Pagination109 leaves
Number of Pages109
ID Numbers
Open LibraryOL14575205M

  Tis book provides an overview of X-ray technology, the historic developmental milestones of modern CT systems, and gives a comprehensive insight into the main reconstruction methods used in computed tomography. Te basis of reconstr- tion is, undoubtedly, mathematics. However, the beauty of computed tomography cannot be understood without a 5/5(1). Define single photon emission computed tomography. single photon emission computed tomography synonyms, single photon emission computed tomography pronunciation, single photon emission computed tomography translation, English dictionary definition of single photon emission computed tomography.

beam hardening artifacts. That statistical methods can cor-rect for beam hardening was anticipated early on [14], but little work appeared in this area. Using monoenergetic photon sources would eliminate beam hardening artifacts but is impractical for diagnostic CT because of SNR considerations. Beam hardening cor-. Page image reconstruction. For example, before exiting the patient, many of the g-ray photons experience photoelectric interactions that cause absorption of photons, and many thus experience Compton scattering, which changes the direction and energy of the original conventional reconstruction techniques (e.g., x-ray CT algorithms) are used in SPECT, the .

Single Photon Emission Computed Tomography (SPECT) for Non-cardiac Indications Effective Date: Oct. 1, Last Revised: Sept. 5, Replaces: N/A RELATED MEDICAL POLICIES: Dopamine Transporter Imaging with Single-photon Emission Computed Tomography Select a hyperlink below to be directed to that section. Single Photon Emission Computed Tomography (SPECT) is a nuclear medicine technique that can be used to image almost any organ system. SPECT imaging is performed by acquiring multiple images (aka projections) with a gamma camera. A topographic reconstruction algorithm is then applied to the multiple two-dimensionalFile Size: 79KB.


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Photon beam dose calculations in regions of tissue heterogeneity using computed tomography by Marc R. Sontag Download PDF EPUB FB2

Abbreviations: CBCT = cone beam computed tomography; CT = computed tomography; SD = standard deviation. Planning CT to cone beam CT matching accuracy Table 7 shows the results of planning CT to cone beam CT (3D3D) matching accuracy over three trials at three different treatment regions, namely, the head and neck, chest, and pelvis, using both Cited by: Purpose: To study the variation of computed tomography (CT) number from a simulator-based scanner and the effect of this variation on photon-dose calculations.

Method and materials: CT images of a cylindrical phantom with multiple inserts were obtained using a commercially-available simulator-CT (Ximatron: Varian, Palo Alto, CA).The linear correlation coefficient and Cited by: single-photon emission computed tomography: [ to-mog´rah-fe ] any method that produces images of single tissue planes.

In conventional radiology, tomographic images (body section radiographs) are produced by motion of the x-ray tube and film or by motion of the patient that blurs the image except in a single plane.

In reconstruction tomography. The analysis and understanding of results of computed tomography (CT) require an understanding of photon attenuation in matter. The high sensitivity and resolution of these devices coupled with the use of a polychromatic photon source require a level and breadth of understanding about photon attenuation not usually required in any particular subspecialty of Cited by: This is really a book for physicists and medical engineers ." (Arpan Banerjee, RAD magazine, January, ) "This monograph on computed tomography (CT) covers the most recent advances in CT technology, image analysis, and reconstruction methods.

It is a well-structured, information rich, and highly technical book. Cited by: 1. Single photon emission computed tomography (SPECT) can be used to image blood flow to the heart (left) in order to monitor conditions such as ischemia (decreased blood flow).

When information gathered via SPECT is combined with imaging information from computed tomography (CT), a fusion image (centre and right) can be obtained.

Radiation Protection Mosby Book. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. Joanna_Garcia Terms in this set (20) Which photon tissue interaction makes a radiography possible because of its creation of contrast.

Compton. Which photon tissue interaction produces radiation that may expose others in the room. The use of computed tomography numbers in dose calculations for radiation therapy.

Huizenga H, Storchi PR. Although corrections for 'beam hardening' and 'scattering' have been implemented in currently available CT scanners, systematic differences exist between a real CT image and an ideal, artefact-free and monochromatic by: 7.

Applications of simulator computed tomography number for photon dose calculations during radiotherapy treatment planning Article in Radiotherapy and Oncology 55(1). Change in management by single photon emission computed tomography/computed tomography over the planar scan.

The SPECT/CT scan had incremental value in 32/83 (%) patients over the planar scan, of whom 17/53 (%) were aged less than 45 years and 15/30 (%) above 45 years of age.

Single-photon emission computed tomography (SPECT, or less commonly, SPET) is a nuclear medicine tomographic imaging technique using gamma rays. It is very similar to conventional nuclear medicine planar imaging using a gamma camera (that is, scintigraphy).

but is able to provide true 3D information. This information is typically presented as cross-sectional slices ICDCM: Accuracy of dose measurements and calculations within and beyond heterogeneous tissues for photon fields and this is exacerbated in regions of tissue heterogeneity.

Tissue heterogeneity was considered insignificant in the brain where stereotactic radiosurgery was first used. is an appropriate dosimeter for measuring dose in Cited by: The impact of photon beam energy and tissue heterogeneities on dose distributions and dosimetric characteristics such as point dose, mean dose, and maximum dose was investigated in the context of.

Cone Beam Computed Tomography, Scattered Photon, Dose Calculation, How to cite this paper: Usui, K., Ogawa, K. and Sasai, K. () Analysis of Dose Cal- culation Accuracy in Cone Beam Computed Tomography with Various Amount of Sca-ttered Photon Contamination. International Journal of Medical Physics, Clinical Engi.

Review paper Imaging dose from cone beam computed tomography in radiation therapy Parham Alaei a, *, Emiliano Spezi b, c a University of Minnesota, Minneapolis, MN, USA b School of Engineering, Cardiff University, Cardiff, Wales, UK c Velindre Cancer Centre, Cardiff, Wales, UK article info Article history: Received 17 February File Size: 2MB.

Tis book provides an overview of X-ray technology, the historic developmental milestones of modern CT systems, and gives a comprehensive insight into the main reconstruction methods used in computed tomography. Te basis of reconstr- tion is, undoubtedly, mathematics. However, the beauty of computed.

The mass attenuation coefficient of the phantom was measured using {sup 60}Co gamma source. The phantoms were scanned using Computed Tomography (CT) scanner and the percentage depth dose (PDD) of the phantom was calculated using treatment planning system (TPS) at 6 MV and 10 MV x-ray and compared to that in solid water phantoms.

imaging doses in radiation therapy from. kilovoltage cone-beam computed tomography. daniel ellis hyer. a dissertation presented to the graduate school of the university of florida in partial fulfillment of the requirements for the degree of doctor of philosophy.

Sontag M () Photon beam dose calculations in regions of tissue heterogeneity using computed tomography. Ph.D. Thesis Univ of Toronto Google Scholar Stewart JR et al. () Computed tomography in Radiation Therapy, Int J Rad One Author: George T.

Chen. Phys. Med. Bid,Val. 37, NO 3, Printed in the UK Review of convergent beam tomography in single photon emission computed tomography G T Gullbergt, G L Zengt, F L Datzz, P E Christian$, C-H Tung.

and H T Morgan§ t Department of Radiology, Medical Imaging Research Laboratory, University of Utah, Salt Lake City, UTUSA i Department of File Size: 1MB.

@article{osti_, title = {SU-E-T Dose Perturbations Near Heterogeneity Junctions for Modulated-Scanning Protons}, author = {Deng, Y and Li, Y and Sheng, Y and Zhao, F and Huang, Z and Sun, L and Zhao, J and Moyers, M and Hsi, W and Shahnazi, K}, abstractNote = {Purpose: To compare calculated and measured doses near heterogeneity junctions of tissue.

For a better understanding of the accuracy of state-of-the-art-radiation therapies, 2-dimensional dosimetry in a patient-like environment will be helpful. Therefore, the dosimetry of EBT3 films in non-water-equivalent tissues was investigated, and the accuracy of commercially-used dose-calculation algorithms was evaluated with EBT3 measurement.

Dose distributions Cited by: 7.Medical definition of single photon emission computed tomography: a medical imaging technique that is used especially for mapping brain function and that is similar to positron-emission tomography in using the photons emitted by the agency of a radioactive tracer to create an image but that differs in being able to detect only a single photon for each nuclear disintegration and .