CT Radiation Dose Reduction by Modifying Primary Factors
... Most routine abdominal and pelvic CT examinations in adults are performed at 120 kVp. In the abdomen and pelvis, the use of lower tube potential has been described for aortoiliac CT angiography, for which the use of 100 kVp can result in about a 35% dose reduction compared with 120 kVp, without affe ...
... Most routine abdominal and pelvic CT examinations in adults are performed at 120 kVp. In the abdomen and pelvis, the use of lower tube potential has been described for aortoiliac CT angiography, for which the use of 100 kVp can result in about a 35% dose reduction compared with 120 kVp, without affe ...
ACR–AAPM Technical Standard for Management of the
... management may still be considered as having met the qualifications if they have performed at least 10 procedures of each type for which they intend to use fluoroscopic guidance under the direction of a qualified physician who has met these standards and who certifies that the trainee meets minimum ...
... management may still be considered as having met the qualifications if they have performed at least 10 procedures of each type for which they intend to use fluoroscopic guidance under the direction of a qualified physician who has met these standards and who certifies that the trainee meets minimum ...
BSc (Med) (Hons) Medical Physics at UCT - UCT Law
... This totals 75 hours per unit, and so a course of 12 units would take about 900 hours. Divided by 120 days (24 weeks in academic term) this equates to approximately 7½ hours a day. The actual workload, including the research project, and including preparation for examinations, will depend on student ...
... This totals 75 hours per unit, and so a course of 12 units would take about 900 hours. Divided by 120 days (24 weeks in academic term) this equates to approximately 7½ hours a day. The actual workload, including the research project, and including preparation for examinations, will depend on student ...
Welcome to Radiology
... What Determines Adequate Penetration? • Abdominal radiograph: • Can see outlines of liver, spleen, kidneys and bowel ...
... What Determines Adequate Penetration? • Abdominal radiograph: • Can see outlines of liver, spleen, kidneys and bowel ...
An immobilization and localization technique for SRT and IMRT of
... dose delivery to brain tumors. Since this method provides coordinate systems for all aforementioned treatment techniques, no additional treatment-specific imaging of a patient and fabrication of immobilization device is necessary. If all TPSs use the same contour set, the proposed method may allow a ...
... dose delivery to brain tumors. Since this method provides coordinate systems for all aforementioned treatment techniques, no additional treatment-specific imaging of a patient and fabrication of immobilization device is necessary. If all TPSs use the same contour set, the proposed method may allow a ...
Three-dimensional (3D) image reconstruction
... processes such as blood flow and function to be observed.[citation needed] Whereas patients exhibiting symptoms of a heart attack or stroke have until now normally had to submit to a variety of examinations preparatory to a precise diagnosis, all of which together took up a considerable amount of ti ...
... processes such as blood flow and function to be observed.[citation needed] Whereas patients exhibiting symptoms of a heart attack or stroke have until now normally had to submit to a variety of examinations preparatory to a precise diagnosis, all of which together took up a considerable amount of ti ...
Name: Date: ______ Period: ______ Page#: ____ X
... High doses of ionizing radiation can destroy body cells; low-level exposure may damage cells. Two kinds of cell damage can occur. Direct damage is cause by the ionization of atoms in important biological molecules. Indirect damage is a result of the formation of free radicals. These are highly react ...
... High doses of ionizing radiation can destroy body cells; low-level exposure may damage cells. Two kinds of cell damage can occur. Direct damage is cause by the ionization of atoms in important biological molecules. Indirect damage is a result of the formation of free radicals. These are highly react ...
Imaging of the Musculoskeletal System
... signal is detected coming from the patient, different tissues will have different imaging properties. If the signal is detected very shortly after the beginning of the procedure, the image that results is called "T1 weighting". In a "T1 weighted" image, fat is bright, fluid and other soft tissue is ...
... signal is detected coming from the patient, different tissues will have different imaging properties. If the signal is detected very shortly after the beginning of the procedure, the image that results is called "T1 weighting". In a "T1 weighted" image, fat is bright, fluid and other soft tissue is ...
Each of the six sections of the written examination objectives is
... Each of the six sections of the written examination objectives is designed to provide an ACVR eligible resident with a framework from which to study. The objectives are not all inclusive but should provide a minimum knowledge base needed to pass the written examination. A candidate must obtain a sco ...
... Each of the six sections of the written examination objectives is designed to provide an ACVR eligible resident with a framework from which to study. The objectives are not all inclusive but should provide a minimum knowledge base needed to pass the written examination. A candidate must obtain a sco ...
Research Center for Radiation Therapy
... On advice from its legal advisor Comair left the Center after stage 1 to avoid leakage of internal know-how to other partners. C-RAD Imaging AB (former name RayTherapy Imaging): Gas Electron Multipliers. C-RAD Imaging develops a fast, sensitive and cost effective radiation detector based on GEMtechn ...
... On advice from its legal advisor Comair left the Center after stage 1 to avoid leakage of internal know-how to other partners. C-RAD Imaging AB (former name RayTherapy Imaging): Gas Electron Multipliers. C-RAD Imaging develops a fast, sensitive and cost effective radiation detector based on GEMtechn ...
The Image Gently in Dentistry Campaign
... imaging may result in an overall increase of up to 29% in effective dose37 and an increase of 17% to over 278% in specific organ doses.37,38 6. Use CBCT only when necessary. ...
... imaging may result in an overall increase of up to 29% in effective dose37 and an increase of 17% to over 278% in specific organ doses.37,38 6. Use CBCT only when necessary. ...
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.