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 ...
mri in radiation treatment planning and assessment
... metabolic MR in Radiation Oncology – Early prediction for treatment toxicity • assessment of blood-brain or blood-tumor barrier opening in high-grade gliomas during radiation therapy using high-resolution post contrast MRI – A significant increase in the contrast uptake in the initially non-contrast ...
... metabolic MR in Radiation Oncology – Early prediction for treatment toxicity • assessment of blood-brain or blood-tumor barrier opening in high-grade gliomas during radiation therapy using high-resolution post contrast MRI – A significant increase in the contrast uptake in the initially non-contrast ...
Is Beta-blockade necessary to obtain diagnostic image
... Coronary computed tomographic angiography (CCTA) is a noninvasive imaging tool for evaluation of the coronary arteries, with high sensitivity and high negative predictive value to exclude significant coronary artery disease (1). In the early days, effective radiation doses of up to 21 mSv have been ...
... Coronary computed tomographic angiography (CCTA) is a noninvasive imaging tool for evaluation of the coronary arteries, with high sensitivity and high negative predictive value to exclude significant coronary artery disease (1). In the early days, effective radiation doses of up to 21 mSv have been ...
Radiation Protection and Performance Evaluation of PET-CT
... radiographers and all supervising physicians have a responsibility to minimise radiation dose to individual patients, staff, and society as a whole, while maintaining the necessary diagnostic image quality. This concept is known as “As Low As Reasonably Achievable (ALARA).” ...
... radiographers and all supervising physicians have a responsibility to minimise radiation dose to individual patients, staff, and society as a whole, while maintaining the necessary diagnostic image quality. This concept is known as “As Low As Reasonably Achievable (ALARA).” ...
Medical Imaging Primer with a Focus on X
... and rays from the sun. In addition, some foods that we ingest contain naturally-occurring radioactive isotopes, such as potassium and carbon. The environment that we live in may also contribute to our exposure to radiation, such as of inhaled radon gas. Not only are we exposed to natural sources of ...
... and rays from the sun. In addition, some foods that we ingest contain naturally-occurring radioactive isotopes, such as potassium and carbon. The environment that we live in may also contribute to our exposure to radiation, such as of inhaled radon gas. Not only are we exposed to natural sources of ...
Stratospheric ozone, ultraviolet radiation and climate change
... There are a few reliable datasets available that confirm the trends obtained from reconstructions at Belsk and Norrköping (Kaurola et al., 2000). New Zealand has a high-quality dataset that shows an upward trend in surface UV radiation from direct measurements (Figure 6) (McKenzie et al., 1999; Bais ...
... There are a few reliable datasets available that confirm the trends obtained from reconstructions at Belsk and Norrköping (Kaurola et al., 2000). New Zealand has a high-quality dataset that shows an upward trend in surface UV radiation from direct measurements (Figure 6) (McKenzie et al., 1999; Bais ...
ACR Practice Parameter for the Performance of Brain Stereotactic
... point in space. As is the case for a number of the other SRS approaches, the robotic delivery approach usually irradiates a subregion of the target with any 1 beam in order to paint the dose for complex, irregularly shaped targets. Stereotactic localization of the lesion uses an appropriate imaging ...
... point in space. As is the case for a number of the other SRS approaches, the robotic delivery approach usually irradiates a subregion of the target with any 1 beam in order to paint the dose for complex, irregularly shaped targets. Stereotactic localization of the lesion uses an appropriate imaging ...
H3 Patients - Western Cape Government
... 20.5 Beta-ray therapy with strontium-90-applicator 20.6 Planning of therapy 20.7 Technical aids 20.8 Oncological surgical procedures 20.9 Special procedures 20.10 Chemotherapy Where patients are not treated in chemotherapy facilities, items 0213, 0214 and 0215 are used instead of items 5790, 5793 an ...
... 20.5 Beta-ray therapy with strontium-90-applicator 20.6 Planning of therapy 20.7 Technical aids 20.8 Oncological surgical procedures 20.9 Special procedures 20.10 Chemotherapy Where patients are not treated in chemotherapy facilities, items 0213, 0214 and 0215 are used instead of items 5790, 5793 an ...
the First Positron Emission tomography–Magnetic Resonance
... 3. Martinez-Moller A, Souvatzoglou M, Delso G, Bundschuh RA, Chefd'hotel C, Ziegler SI, et al. Tissue classification as a potential approach for attenuation correction in whole-body PET/MRI: evaluation with PET/CT data. J Nucl Med. 2009;50:520-6. cross ref 4. Eiber M, Martinez-Möller A, Souvatzogl ...
... 3. Martinez-Moller A, Souvatzoglou M, Delso G, Bundschuh RA, Chefd'hotel C, Ziegler SI, et al. Tissue classification as a potential approach for attenuation correction in whole-body PET/MRI: evaluation with PET/CT data. J Nucl Med. 2009;50:520-6. cross ref 4. Eiber M, Martinez-Möller A, Souvatzogl ...
Assessment and Optimization of Radiation Dosimetry and Image
... of the image is increased, but it also increased the radiation dose that being absorb by the patient. Level of acceptance of image quality should be recognized before any optimization can be done [4-6]. This to ensure that any clinical diagnostic information needed is not missing out from the image ...
... of the image is increased, but it also increased the radiation dose that being absorb by the patient. Level of acceptance of image quality should be recognized before any optimization can be done [4-6]. This to ensure that any clinical diagnostic information needed is not missing out from the image ...
Full-Paying - Western Cape Government
... 20.5 Beta-ray therapy with strontium-90-applicator 20.6 Planning of therapy 20.7 Technical aids 20.8 Oncological surgical procedures 20.9 Special procedures 20.10 Chemotherapy Where patients are not treated in chemotherapy facilities, items 0213, 0214 and 0215 are used instead of items 5790, 5793 an ...
... 20.5 Beta-ray therapy with strontium-90-applicator 20.6 Planning of therapy 20.7 Technical aids 20.8 Oncological surgical procedures 20.9 Special procedures 20.10 Chemotherapy Where patients are not treated in chemotherapy facilities, items 0213, 0214 and 0215 are used instead of items 5790, 5793 an ...
TREAT WHAT YOU SEE see what you treat
... Vero’s deep and broad integration drives simplicity. Vero’s integration is so comprehensive that you experience an ease of handling and intuitive workflow design that even enables complete operational handling by one person. The network interface is designed for physicians to actively participate in ...
... Vero’s deep and broad integration drives simplicity. Vero’s integration is so comprehensive that you experience an ease of handling and intuitive workflow design that even enables complete operational handling by one person. The network interface is designed for physicians to actively participate in ...
Radiation Safety for the Cardiac Sonographer
... receiving radioisotopes for nuclear scans shortly preceding the performance of TTE has increased, this exposure, along with the exposure during TEEFPs, merits consideration. Scheduling should include rotation of the cardiac sonography staff through these areas to minimize or dilute the risk for expo ...
... receiving radioisotopes for nuclear scans shortly preceding the performance of TTE has increased, this exposure, along with the exposure during TEEFPs, merits consideration. Scheduling should include rotation of the cardiac sonography staff through these areas to minimize or dilute the risk for expo ...
X-ray generation, interaction and detection
... • Source-skin distance • Peak skin dose when using multiple gantry positions and FOVs less useful to estimate skin burn risk' (a small area exposed to a high dose is reported the same as a large area with a smaller dose) ...
... • Source-skin distance • Peak skin dose when using multiple gantry positions and FOVs less useful to estimate skin burn risk' (a small area exposed to a high dose is reported the same as a large area with a smaller dose) ...
ACR–ASTRO Practice Parameter for Image
... evaluation of disease stage; assessment of comorbidities and previous treatments; thorough exploration of various treatment options; ample and understandable discussion with patients regarding the impact of treatment, including benefits and potential harm; knowledgeable conduct of IGRT as outlined b ...
... evaluation of disease stage; assessment of comorbidities and previous treatments; thorough exploration of various treatment options; ample and understandable discussion with patients regarding the impact of treatment, including benefits and potential harm; knowledgeable conduct of IGRT as outlined b ...
Doing More With Less (Radiation)
... “Depending on a physician's needs, the images can be constructed in any dimension, better aiding in our diagnosis,” says Dr. Wilson. The biggest improvement, just recently made available, is a dose reduction software program that can reduce patient radiation exposure by up to 60%. This also allows u ...
... “Depending on a physician's needs, the images can be constructed in any dimension, better aiding in our diagnosis,” says Dr. Wilson. The biggest improvement, just recently made available, is a dose reduction software program that can reduce patient radiation exposure by up to 60%. This also allows u ...
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... the adoption of routine 3 -D planning. Whereas 3-D planning for every patient may not be necessary, it has already been found to be useful and practical for most tumors or tumor sites (head and neck, lung, prostrate). Treatment of well -localized small lesions (e.g., <4 cm in diameter) in the brain ...
... the adoption of routine 3 -D planning. Whereas 3-D planning for every patient may not be necessary, it has already been found to be useful and practical for most tumors or tumor sites (head and neck, lung, prostrate). Treatment of well -localized small lesions (e.g., <4 cm in diameter) in the brain ...
Radiation therapy
Radiation therapy or radiotherapy, often abbreviated RT, RTx, or XRT, is therapy using ionizing radiation, generally as part of cancer treatment to control or kill malignant cells. Radiation therapy may be curative in a number of types of cancer if they are localized to one area of the body. It may also be used as part of adjuvant therapy, to prevent tumor recurrence after surgery to remove a primary malignant tumor (for example, early stages of breast cancer). Radiation therapy is synergistic with chemotherapy, and has been used before, during, and after chemotherapy in susceptible cancers. The subspecialty of oncology that focuses on radiotherapy is called radiation oncology.Radiation therapy is commonly applied to the cancerous tumor because of its ability to control cell growth. Ionizing radiation works by damaging the DNA of cancerous tissue leading to cellular death. To spare normal tissues (such as skin or organs which radiation must pass through to treat the tumor), shaped radiation beams are aimed from several angles of exposure to intersect at the tumor, providing a much larger absorbed dose there than in the surrounding, healthy tissue. Besides the tumour itself, the radiation fields may also include the draining lymph nodes if they are clinically or radiologically involved with tumor, or if there is thought to be a risk of subclinical malignant spread. It is necessary to include a margin of normal tissue around the tumor to allow for uncertainties in daily set-up and internal tumor motion. These uncertainties can be caused by internal movement (for example, respiration and bladder filling) and movement of external skin marks relative to the tumor position.Radiation oncology is the medical specialty concerned with prescribing radiation, and is distinct from radiology, the use of radiation in medical imaging and diagnosis. Radiation may be prescribed by a radiation oncologist with intent to cure (""curative"") or for adjuvant therapy. It may also be used as palliative treatment (where cure is not possible and the aim is for local disease control or symptomatic relief) or as therapeutic treatment (where the therapy has survival benefit and it can be curative). It is also common to combine radiation therapy with surgery, chemotherapy, hormone therapy, immunotherapy or some mixture of the four. Most common cancer types can be treated with radiation therapy in some way.The precise treatment intent (curative, adjuvant, neoadjuvant, therapeutic, or palliative) will depend on the tumor type, location, and stage, as well as the general health of the patient. Total body irradiation (TBI) is a radiation therapy technique used to prepare the body to receive a bone marrow transplant. Brachytherapy, in which a radiation source is placed inside or next to the area requiring treatment, is another form of radiation therapy that minimizes exposure to healthy tissue during procedures to treat cancers of the breast, prostate and other organs.Radiation therapy has several applications in non-malignant conditions, such as the treatment of trigeminal neuralgia, acoustic neuromas, severe thyroid eye disease, pterygium, pigmented villonodular synovitis, and prevention of keloid scar growth, vascular restenosis, and heterotopic ossification. The use of radiation therapy in non-malignant conditions is limited partly by worries about the risk of radiation-induced cancers.