Acceptance Testing and Quality Control of Dental Imaging
... It is important to properly perform tests for image quality and safety purposes right after the installation and during routine operation of a dental x-ray unit. Having a quality control (QC) program for dental x-ray facilities is instrumental in ensuring that patients are not receiving excessive ra ...
... It is important to properly perform tests for image quality and safety purposes right after the installation and during routine operation of a dental x-ray unit. Having a quality control (QC) program for dental x-ray facilities is instrumental in ensuring that patients are not receiving excessive ra ...
Image-guided radiation therapy (IGRT): practical
... Abstract The use of imaging to maximize precision and accuracy throughout the entire process of radiation therapy (RT) delivery has been called “Image-guided RT” (IGRT). RT has long been image guided: in fact, historically, the portal films and later electronic megavoltage images represented an earl ...
... Abstract The use of imaging to maximize precision and accuracy throughout the entire process of radiation therapy (RT) delivery has been called “Image-guided RT” (IGRT). RT has long been image guided: in fact, historically, the portal films and later electronic megavoltage images represented an earl ...
position paper techniques and technologies in radiation oncology
... Radiation oncology is a specialty in which highly trained oncologists use their knowledge of radiation cell biology, and technology to treat cancer with radiation. Radiation therapy can be used to treat almost all cancers, anywhere in the body. Radiation oncology has a major positive impact on local ...
... Radiation oncology is a specialty in which highly trained oncologists use their knowledge of radiation cell biology, and technology to treat cancer with radiation. Radiation therapy can be used to treat almost all cancers, anywhere in the body. Radiation oncology has a major positive impact on local ...
Cone Beam Computed Tomography in Endodontics: An Overview.
... are limited in differentiating superimposing structures. This drawback has been be overcome by Cone Beam Computed Tomography (CBCT). CBCT is a medical imaging technique consisting of X-ray based computed tomography where the X-rays are divergent forming a cone. It has the ability to eliminate superi ...
... are limited in differentiating superimposing structures. This drawback has been be overcome by Cone Beam Computed Tomography (CBCT). CBCT is a medical imaging technique consisting of X-ray based computed tomography where the X-rays are divergent forming a cone. It has the ability to eliminate superi ...
Technical assessment of a cone-beam CT scanner
... protocols to provide reduced radiation dose without compromising pertinent task-based imaging performance. The revised protocols yielded Do ranging 2.9–5.7 mGy, representing a ∼30% reduction in dose from the original technique chart. Out-of-field dose was ∼10% of Do at a distance of ∼8 cm from the f ...
... protocols to provide reduced radiation dose without compromising pertinent task-based imaging performance. The revised protocols yielded Do ranging 2.9–5.7 mGy, representing a ∼30% reduction in dose from the original technique chart. Out-of-field dose was ∼10% of Do at a distance of ∼8 cm from the f ...
X-ray Tube and Generator – Basic principles and construction
... 1989 - 17,000 manSv; 1999 - 20,000 manSv (risk estimate approx. 700 cancer deaths/year); 2008 - 25,000 manSv Safety in Diagnostic Radiology, IPEM, 1995; UK population dose from medical X-ray examinations , D. Hart , B. F. Wall, 2002; Considerations for Radioactive Substances Regulation under the Rad ...
... 1989 - 17,000 manSv; 1999 - 20,000 manSv (risk estimate approx. 700 cancer deaths/year); 2008 - 25,000 manSv Safety in Diagnostic Radiology, IPEM, 1995; UK population dose from medical X-ray examinations , D. Hart , B. F. Wall, 2002; Considerations for Radioactive Substances Regulation under the Rad ...
Adaptive Iterative Reconstruction in CT: What Does It
... reduction of streak and other artifacts with iterative reconstruction compared to FBP. Other clinical studies on the use of iterative reconstruction for CT exams of specific organ systems and disease processes have been reported.(8-11) A recent review of 1616 articles dealing with clinical use of it ...
... reduction of streak and other artifacts with iterative reconstruction compared to FBP. Other clinical studies on the use of iterative reconstruction for CT exams of specific organ systems and disease processes have been reported.(8-11) A recent review of 1616 articles dealing with clinical use of it ...
Web-based system for Quality Assurance of Radiation Oncology
... I would like to start by thanking my supervisor Dr. François DeBlois for his invaluable support throughout my thesis. His guidance and encouragement at all stages of this project made it a wonderful experience. I would like to acknowledge Dr. Gabriela Stroian for the many hours spent carefully discu ...
... I would like to start by thanking my supervisor Dr. François DeBlois for his invaluable support throughout my thesis. His guidance and encouragement at all stages of this project made it a wonderful experience. I would like to acknowledge Dr. Gabriela Stroian for the many hours spent carefully discu ...
Novalis Tx™ image-guided radiosurgery linear accelerator
... intensity at the depth of maximum buildup (Dmax) does not exceed 109% of the central axis intensity anywhere in the measurement plane of any field size. 1.4 Leakage: The X-ray absorbed dose does not exceed 0.1% of the absorbed dose at the isocenter measured anywhere in the patient plane outside of t ...
... intensity at the depth of maximum buildup (Dmax) does not exceed 109% of the central axis intensity anywhere in the measurement plane of any field size. 1.4 Leakage: The X-ray absorbed dose does not exceed 0.1% of the absorbed dose at the isocenter measured anywhere in the patient plane outside of t ...
Innova X-ray Dose Efficiency: Objective Evidence
... • Zontar 2010: This study, published in the peer-reviewed journal Radiation Protection Dosimetry, conducted by four of the five authors of the 2009 study above, extends the previous work and provides more data on the skin dose (CDirp) results from the three procedure sites that provided them; the ...
... • Zontar 2010: This study, published in the peer-reviewed journal Radiation Protection Dosimetry, conducted by four of the five authors of the 2009 study above, extends the previous work and provides more data on the skin dose (CDirp) results from the three procedure sites that provided them; the ...
Incorporation of functional imaging data in the evaluation of dose
... distributions were evaluated using the generalized EUD and FEUD models with a lung a value of 0.96. Furthermore, a non-small cell lung cancer patient, who had previously received 3D external beam RT treatment at our institution, was inversely planned using the optimization algorithm of the PLUNC tre ...
... distributions were evaluated using the generalized EUD and FEUD models with a lung a value of 0.96. Furthermore, a non-small cell lung cancer patient, who had previously received 3D external beam RT treatment at our institution, was inversely planned using the optimization algorithm of the PLUNC tre ...
Multiply Your Potential
... of excited Flash users is continuously growing – not least because current Flash users are already purchasing their second, third, fourth, and even up to tenth system. The latest Dual Source Dual Energy CT scanner has the fastest volume acquisition speed and highest heart rate-independent temporal r ...
... of excited Flash users is continuously growing – not least because current Flash users are already purchasing their second, third, fourth, and even up to tenth system. The latest Dual Source Dual Energy CT scanner has the fastest volume acquisition speed and highest heart rate-independent temporal r ...
General Radiography - Santa Rosa Junior College
... - A two-page term paper (for each credit unit) * 60% if a final is not required * 30% if a final is required Note: This final paper should summarize the subjects, their efficacy, and the learning experience you have acquired through this course. This final paper will be graded based on grammar, orga ...
... - A two-page term paper (for each credit unit) * 60% if a final is not required * 30% if a final is required Note: This final paper should summarize the subjects, their efficacy, and the learning experience you have acquired through this course. This final paper will be graded based on grammar, orga ...
Why Marking Remains a Best Practice in
... density markers used today do not cause a significant artifact, and that biopsy clips and even some calcifications in the breast can induce a more significant artifact than skin markers on mammography. ...
... density markers used today do not cause a significant artifact, and that biopsy clips and even some calcifications in the breast can induce a more significant artifact than skin markers on mammography. ...
Iterative Reconstruction in Image Space
... Up to 60% lower dose In the broad spectrum of diagnostic methods and equipment available today, CT has assumed more and more importance. As CT has become a standard examination for routine work and the number of exams worldwide is increasing, we at Siemens wanted to further minimize radiation and ma ...
... Up to 60% lower dose In the broad spectrum of diagnostic methods and equipment available today, CT has assumed more and more importance. As CT has become a standard examination for routine work and the number of exams worldwide is increasing, we at Siemens wanted to further minimize radiation and ma ...
Policy Statement on Thyroid Shielding During Diagnostic Medical
... processes, is among the most susceptible sites to radiation-induced carcinogenesis. Risks of radiation exposure are thus of special concern to the American Thyroid Association (ATA). The risk of thyroid cancer arising from radiation exposure is strongly dependent on age at exposure. This risk is gre ...
... processes, is among the most susceptible sites to radiation-induced carcinogenesis. Risks of radiation exposure are thus of special concern to the American Thyroid Association (ATA). The risk of thyroid cancer arising from radiation exposure is strongly dependent on age at exposure. This risk is gre ...
Dose Reduction options in Cardiac CT
... Hussmann L et al (2008) Feasibility of low-dose coronary CT angiography…. Eur. Heart J 29:191197 Maruyama T et sl (2008) Radiation dose reduction and coronary assessability of ECG gated CTA….. J Am Coll Cardiol 52:1450-1455 Shuman WP et al (2008) Prospective v retrospective ECG gating for 64 detecto ...
... Hussmann L et al (2008) Feasibility of low-dose coronary CT angiography…. Eur. Heart J 29:191197 Maruyama T et sl (2008) Radiation dose reduction and coronary assessability of ECG gated CTA….. J Am Coll Cardiol 52:1450-1455 Shuman WP et al (2008) Prospective v retrospective ECG gating for 64 detecto ...
Using MRI to diagnose Appendicitis - Stony Brook University School
... points (negative appendectomy rate, perforation rate, time from triage to treatment and discharge home) compared with CT. They showed that US/MRI is comparable to CT, but the main question was not of diagnostic accuracy, and only about 80% of patients were followed up after negative imaging. No cost ...
... points (negative appendectomy rate, perforation rate, time from triage to treatment and discharge home) compared with CT. They showed that US/MRI is comparable to CT, but the main question was not of diagnostic accuracy, and only about 80% of patients were followed up after negative imaging. No cost ...
Study the Quality Assurance of Conventional X
... measurement of the peak electrical potential across the Xray tube when it is operating. The X-ray tube kVp is most critical. A small error of this variable will have a greater effect on the final radiographic image than will an equivalent variation in any of the other parameters such as tube current ...
... measurement of the peak electrical potential across the Xray tube when it is operating. The X-ray tube kVp is most critical. A small error of this variable will have a greater effect on the final radiographic image than will an equivalent variation in any of the other parameters such as tube current ...
Treatment of Neck Lines and Forehead Rhytids
... d ¼ ð3ma ½ma þ ms ð1 gÞÞ1=2 The optical window from 1.2 to 1.8 mm appears to be well suited for nonablative remodeling as penetration depth within this range is limited to the upper dermis.9–12 Table 1 displays the absorption and reduced scattering coefficients of human skin in this specific wind ...
... d ¼ ð3ma ½ma þ ms ð1 gÞÞ1=2 The optical window from 1.2 to 1.8 mm appears to be well suited for nonablative remodeling as penetration depth within this range is limited to the upper dermis.9–12 Table 1 displays the absorption and reduced scattering coefficients of human skin in this specific wind ...
The Influence of X-Ray Spectra Filtration on Image Quality
... now between 1 and 20 mSv depending on the scan length and scan region. Doses delivered to patients undergoing CT examinations are relatively high in comparison with radiation doses associated with other types of diagnostic radiological procedures. There is a growing concern that radiation doses deli ...
... now between 1 and 20 mSv depending on the scan length and scan region. Doses delivered to patients undergoing CT examinations are relatively high in comparison with radiation doses associated with other types of diagnostic radiological procedures. There is a growing concern that radiation doses deli ...
A case reportof the cervix
... Rationale: brachytherapy is administered in the treatment of patients with locally advanced cervical cancer following chemoradiotherapy. Lack of local anatomy evaluation prior to this procedure might lead to the selection of an inappropriate brachytherapy applicator, increasing the risk of side effe ...
... Rationale: brachytherapy is administered in the treatment of patients with locally advanced cervical cancer following chemoradiotherapy. Lack of local anatomy evaluation prior to this procedure might lead to the selection of an inappropriate brachytherapy applicator, increasing the risk of side effe ...
MSc Medical Physics 2010-11 v2
... The overall aim of this introductory module is to provide trainees with knowledge and understanding of the basic science and scientific knowledge that will underpin study in any of the three divisions of healthcare science namely Physical Sciences and Biomedical Engineering, Life Sciences and Physio ...
... The overall aim of this introductory module is to provide trainees with knowledge and understanding of the basic science and scientific knowledge that will underpin study in any of the three divisions of healthcare science namely Physical Sciences and Biomedical Engineering, Life Sciences and Physio ...
Garba_Idris_MASTERS
... manufacturers showed statistically significant differences (p=0.003) and (p=0.03) respectively. In the case of the scanners of a different model but the same number of slices, the comparison of DLP was statistically significant (p=0.005) while no significant difference was noted in the measured CTDI ...
... manufacturers showed statistically significant differences (p=0.003) and (p=0.03) respectively. In the case of the scanners of a different model but the same number of slices, the comparison of DLP was statistically significant (p=0.005) while no significant difference was noted in the measured CTDI ...
Image Guided Radiation Therapy: A Refresher
... risk group according to the NCCN (high- to very high risk vs. intermediate- to low-risk), dose (70 vs. 78 Gy), average crosssectional area (>16 vs. <16 cm2) and, unexpectedly, the use of implanted markers as opposed to bony structures for patient positioning. In retrospect, the margins around the cl ...
... risk group according to the NCCN (high- to very high risk vs. intermediate- to low-risk), dose (70 vs. 78 Gy), average crosssectional area (>16 vs. <16 cm2) and, unexpectedly, the use of implanted markers as opposed to bony structures for patient positioning. In retrospect, the margins around the cl ...
Radiation burn
A radiation burn is damage to the skin or other biological tissue caused by exposure to radiation. The radiation types of greatest concern are thermal radiation, radio frequency energy, ultraviolet light and ionizing radiation.The most common type of radiation burn is a sunburn caused by UV radiation. High exposure to X-rays during diagnostic medical imaging or radiotherapy can also result in radiation burns. As the ionizing radiation interacts with cells within the body—damaging them—the body responds to this damage, typically resulting in erythema—that is, redness around the damaged area. Radiation burns are often associated with radiation-induced cancer due to the ability of ionizing radiation to interact with and damage DNA, occasionally inducing a cell to become cancerous. Cavity magnetrons can be improperly used to create surface and internal burning. Depending on the photon energy, gamma radiation can cause very deep gamma burns, with 60Co internal burns are common. Beta burns tend to be shallow as beta particles are not able to penetrate deep into the person; these burns can be similar to sunburn.Radiation burns can also occur with high power radio transmitters at any frequency where the body absorbs radio frequency energy and converts it to heat. The U.S. Federal Communications Commission (FCC) considers 50 watts to be the lowest power above which radio stations must evaluate emission safety. Frequencies considered especially dangerous occur where the human body can become resonant, at 35 MHz, 70 MHz, 80-100 MHz, 400 MHz, and 1 GHz. Exposure to microwaves of too high intensity can cause microwave burns.