Optimisation in general radiography (PDF Available)
... Radiography using film has been an established method for imaging the internal organs of the body for over 100 years. Surveys carried out during the 1980s identified a wide range in patient doses showing that there was scope for dosage reduction in many hospitals. This paper discusses factors that n ...
... Radiography using film has been an established method for imaging the internal organs of the body for over 100 years. Surveys carried out during the 1980s identified a wide range in patient doses showing that there was scope for dosage reduction in many hospitals. This paper discusses factors that n ...
Diagnostic Reference Levels (DRL)
... Diagnostic Reference Level (DRL) is a dose metric for an average size patient or a phantom. CT Dose Index (CTDIvol) in CT can be used as a metric in a quality control program to identify possible situations where protocols, equipment, or procedures may be produce high radiation doses to patients. Th ...
... Diagnostic Reference Level (DRL) is a dose metric for an average size patient or a phantom. CT Dose Index (CTDIvol) in CT can be used as a metric in a quality control program to identify possible situations where protocols, equipment, or procedures may be produce high radiation doses to patients. Th ...
RAD309
... from sensitive structures can be very effective Decrease the exposure: The correct balance between dose and image quality .The guidelines also give reference values for patient dose for particular examinations. Customize the exposure to patient size: adjust the exposure factors to compensate for cha ...
... from sensitive structures can be very effective Decrease the exposure: The correct balance between dose and image quality .The guidelines also give reference values for patient dose for particular examinations. Customize the exposure to patient size: adjust the exposure factors to compensate for cha ...
Novalis Tx™ image-guided radiosurgery linear accelerator
... includes on-site demonstration of the matched beams as described below. Fine Beam Matching to existing accelerator systems installed outside a 1-year time frame may be available as a purchasable option (refer to section 5.3). 5.1 Restrictions and Definitions ...
... includes on-site demonstration of the matched beams as described below. Fine Beam Matching to existing accelerator systems installed outside a 1-year time frame may be available as a purchasable option (refer to section 5.3). 5.1 Restrictions and Definitions ...
guided radiation therapy
... al. (27) proposed the development of MV CT based on the 50-MV scanning photon beam of the racetrack microtron; this approach offers elevated contrast due to the increasing pair-production cross-section at X-ray energies over 1.022 MeV. More recently, Ruchala et al. have reported on the development o ...
... al. (27) proposed the development of MV CT based on the 50-MV scanning photon beam of the racetrack microtron; this approach offers elevated contrast due to the increasing pair-production cross-section at X-ray energies over 1.022 MeV. More recently, Ruchala et al. have reported on the development o ...
comparison of localization performance with implanted fiducial
... (CBCT)– based setup corrections as compared with orthogonal megavoltage (MV) portal image-based corrections for patients undergoing external-beam radiotherapy of the prostate. Methods and Materials: Daily cone-beam CT volumetric images were acquired after setup for patients with three intraprostatic ...
... (CBCT)– based setup corrections as compared with orthogonal megavoltage (MV) portal image-based corrections for patients undergoing external-beam radiotherapy of the prostate. Methods and Materials: Daily cone-beam CT volumetric images were acquired after setup for patients with three intraprostatic ...
Managing the imaging dose during Image-guided Radiotherapy Martin J Murphy PhD
... are 10 times more sensitive than adults; girls are more sensitive than boys, women have different organ sensitivities than men. • Not everyone is in the same risk category – a seventy year old man undergoing image-guided prostate treatments is in an entirely different risk situation than a 15 year o ...
... are 10 times more sensitive than adults; girls are more sensitive than boys, women have different organ sensitivities than men. • Not everyone is in the same risk category – a seventy year old man undergoing image-guided prostate treatments is in an entirely different risk situation than a 15 year o ...
Title Evaluation of radiation dose and image quality for the Varian
... The advent of three-dimensional (3D) cross-sectional imaging, 3D conformal radiotherapy and intensity-modulated radiation therapy (IMRT) has been shown to allow dose escalation and reduce normal tissue toxicity, thus improving local control and disease-free survival [1], [2], [3] and [4]. The planni ...
... The advent of three-dimensional (3D) cross-sectional imaging, 3D conformal radiotherapy and intensity-modulated radiation therapy (IMRT) has been shown to allow dose escalation and reduce normal tissue toxicity, thus improving local control and disease-free survival [1], [2], [3] and [4]. The planni ...
Development and Implementation of an Anthropomorphic Pediatric
... Proton therapy is gaining acceptance as a cancer treatment modality, as it allows for dose deposition to the target volume while sparing the surrounding healthy tissue. This technique is advantageous for craniospinal pediatric patients, as it reduces the radiation side effects that can occur. The pu ...
... Proton therapy is gaining acceptance as a cancer treatment modality, as it allows for dose deposition to the target volume while sparing the surrounding healthy tissue. This technique is advantageous for craniospinal pediatric patients, as it reduces the radiation side effects that can occur. The pu ...
here - IROC Houston
... The prescribed dose to the phantom is 6 Gy(RBE) to the isodose line circumscribing the PTV. It should be delivered in 1 fraction with the following constraints: Prescribed dose of 6 Gy(RBE) to at least 95% of the PTV Minimum dose of 5.4 Gy(RBE) to at least 99% of the PTV In this plan, you are fr ...
... The prescribed dose to the phantom is 6 Gy(RBE) to the isodose line circumscribing the PTV. It should be delivered in 1 fraction with the following constraints: Prescribed dose of 6 Gy(RBE) to at least 95% of the PTV Minimum dose of 5.4 Gy(RBE) to at least 99% of the PTV In this plan, you are fr ...
M.Sc. Medical Physics Regulations and Syllabus from 2008
... The Internal Assessment of the candidate has to be assessed on the above points and a report has to be submitted by the institution as detailed below:The aggregate of Final Internal Assessment Marks should be submitted 2 months before the commencement of the exam as per scheme of examination shall b ...
... The Internal Assessment of the candidate has to be assessed on the above points and a report has to be submitted by the institution as detailed below:The aggregate of Final Internal Assessment Marks should be submitted 2 months before the commencement of the exam as per scheme of examination shall b ...
Clinical commissioning and use of the Novalis Tx linear accelerator
... been shown to sometimes be problematic for large fields.(49) Large variations were observed with different detectors with large field sizes. Because of such measurement difficulties, Monte Carlo (MC) simulations have been increasingly used as a promising alternative,(46,58-60) but the MC algorithms ...
... been shown to sometimes be problematic for large fields.(49) Large variations were observed with different detectors with large field sizes. Because of such measurement difficulties, Monte Carlo (MC) simulations have been increasingly used as a promising alternative,(46,58-60) but the MC algorithms ...
DRL Reference Guide - NC Radiation Protection
... Diagnostic Reference Level (DRL) is a dose metric for an average size patient or a phantom. Entrance Skin Air Kerma (ESAK) in radiography, Entrance Air Kerma Rate in fluoroscopy, and CT Dose Index (CTDIvol) in CT can be used as metric in a quality control program to identify possible situations wher ...
... Diagnostic Reference Level (DRL) is a dose metric for an average size patient or a phantom. Entrance Skin Air Kerma (ESAK) in radiography, Entrance Air Kerma Rate in fluoroscopy, and CT Dose Index (CTDIvol) in CT can be used as metric in a quality control program to identify possible situations wher ...
Canadian Association of Radiologists Radiation Protection Working
... radiation exposure in medicine is only useful if the entire patient is uniformly exposed, such as fetal radiation exposure, or if the skin entrance dose is monitored for deterministic effects, which may occur in long fluoroscopic procedures or CT perfusion studies. The majority of medical imaging pr ...
... radiation exposure in medicine is only useful if the entire patient is uniformly exposed, such as fetal radiation exposure, or if the skin entrance dose is monitored for deterministic effects, which may occur in long fluoroscopic procedures or CT perfusion studies. The majority of medical imaging pr ...
Physics/Engineering Aspects of Medical Accelerators
... Radiologic images are still necessary. Med Accels Jan2013 Waldron D2 27 ...
... Radiologic images are still necessary. Med Accels Jan2013 Waldron D2 27 ...
Chapter 2 Scope of Coverage for Part I and Part II Resident Physicist
... 8 Which of the following working area is least likely to be classified as a controlled area? (A) An operational area where it is likely that persons working inside will receive a dose exceeding 6 mSv in a year (B) A room in which five mobile X-ray machines are regularly being stored (C) An isotope p ...
... 8 Which of the following working area is least likely to be classified as a controlled area? (A) An operational area where it is likely that persons working inside will receive a dose exceeding 6 mSv in a year (B) A room in which five mobile X-ray machines are regularly being stored (C) An isotope p ...
Radiation safety and CT dose
... Source of Radiation Exposure David J. Brenner, Ph.D., D.Sc., and Eric J. Hall, D.Phil., D.Sc. ...
... Source of Radiation Exposure David J. Brenner, Ph.D., D.Sc., and Eric J. Hall, D.Phil., D.Sc. ...
Breakthrough Technology Expanding the Potential in
... leading products and world firsts on its list of credits. However as befits a company founded by a clinician it not only develops outstanding medical technology but it ensures this technology can be successfully implemented in a busy clinical environment and make a real difference to the patient qua ...
... leading products and world firsts on its list of credits. However as befits a company founded by a clinician it not only develops outstanding medical technology but it ensures this technology can be successfully implemented in a busy clinical environment and make a real difference to the patient qua ...
average glandular dose
... Contrast: capability of the system to make visible small differences in soft tissue density Sharpness: capability of the system to make visible small details (calcifications down to 0.1 mm) Dose: the female breast is a very radiosensitive organ and there is a risk of carcinogenesis associated with t ...
... Contrast: capability of the system to make visible small differences in soft tissue density Sharpness: capability of the system to make visible small details (calcifications down to 0.1 mm) Dose: the female breast is a very radiosensitive organ and there is a risk of carcinogenesis associated with t ...
Panoramic Dental X-ray
... tissues, such as the muscles. It is generally used as an initial evaluation of the bones and teeth. Because your mouth is curved, the panoramic x-ray can sometimes create a slightly blurry image where accurate measurements of your teeth and jaw are not possible. If your dentist or surgeon needs more ...
... tissues, such as the muscles. It is generally used as an initial evaluation of the bones and teeth. Because your mouth is curved, the panoramic x-ray can sometimes create a slightly blurry image where accurate measurements of your teeth and jaw are not possible. If your dentist or surgeon needs more ...
D51 - Viktor`s Notes for the Neurosurgery Resident
... releasing the excess energy initially used to deflect them from alignment. The rate at which this realignment occurs depends on the rate that the added energy is released to the surrounding environment. This process is called longitudinal relaxation. The time required for 63 percent of the magnetiza ...
... releasing the excess energy initially used to deflect them from alignment. The rate at which this realignment occurs depends on the rate that the added energy is released to the surrounding environment. This process is called longitudinal relaxation. The time required for 63 percent of the magnetiza ...
Walter et al. (2007) Radiotherapy and Oncology 85
... Department of Radiation Oncology, University of Heidelberg, Mannheim, Germany ...
... Department of Radiation Oncology, University of Heidelberg, Mannheim, Germany ...
Enhancing Patient Safety in Today`s Healthcare
... performed in the United States has increased from approximately 20 million to more than 70 million per year, including 5 million pediatric CT exams.1 In addition, a comparison of the sources of all radiation exposure to the US population between 1982 and 2006 showed an increase in the contribution o ...
... performed in the United States has increased from approximately 20 million to more than 70 million per year, including 5 million pediatric CT exams.1 In addition, a comparison of the sources of all radiation exposure to the US population between 1982 and 2006 showed an increase in the contribution o ...
Pretreatment Evaluation of Prostate Cancer: Role of MR Imaging
... RadioGraphics 2004; 24:S167–S180 ● Published online 10.1148/24si045516 ● Content Codes: ...
... RadioGraphics 2004; 24:S167–S180 ● Published online 10.1148/24si045516 ● Content Codes: ...
aS1000 - Medical Physics International Journal
... the main goal of radiation therapy, which is the delivery of a high conformal radiation dose to the target while sparing the surrounding normal tissue. Although, rigorous patient positioning is followed, with the advancement of collimation and treatment planning systems, uncertainties of exact tumor ...
... the main goal of radiation therapy, which is the delivery of a high conformal radiation dose to the target while sparing the surrounding normal tissue. Although, rigorous patient positioning is followed, with the advancement of collimation and treatment planning systems, uncertainties of exact tumor ...
Proton therapy
Proton therapy or proton beam therapy is a medical procedure, a type of particle therapy that uses a beam of protons to irradiate diseased tissue, most often in the treatment of cancer. Proton therapy's chief advantage over other types of external beam radiotherapy is that as a charged particle the dose is deposited over a narrow range and there is minimal exit dose.