Role of CTDI to estimate patient dose from a single slice to multi
... Gutam Buddha Nagar 201308, Uttar Pradesh India. ...
... Gutam Buddha Nagar 201308, Uttar Pradesh India. ...
chapter 7. clinical treatment planning in external photon
... Simulators provide the ability to mimic most treatment geometries attainable on megavoltage treatment units, and to visualize the resulting treatment fields on radiographs or under fluoroscopic examination of the patient. They consist of a gantry and couch arrangement similar to that found on isocen ...
... Simulators provide the ability to mimic most treatment geometries attainable on megavoltage treatment units, and to visualize the resulting treatment fields on radiographs or under fluoroscopic examination of the patient. They consist of a gantry and couch arrangement similar to that found on isocen ...
09. Quality Assurance in Paediatric Radiological - RPOP
... imaging aims to ensure quality during all phases of the operation the service • One aspect of such programmes focuses on the operation of equipment, and is required by the BSS, many governments, the EU and recommended by numerous professional bodies • A quality assurance programme may be seen as par ...
... imaging aims to ensure quality during all phases of the operation the service • One aspect of such programmes focuses on the operation of equipment, and is required by the BSS, many governments, the EU and recommended by numerous professional bodies • A quality assurance programme may be seen as par ...
Phylogenetic Insights on Adaptive Radiation
... stage in the evolution of the vertebrate eye does not trivialize natural selection. If it can be shown that diversification among closely related species tends to result from adaptive radiation, it may be reasonable to suggest that earlier diversification events involved the same process and perhaps e ...
... stage in the evolution of the vertebrate eye does not trivialize natural selection. If it can be shown that diversification among closely related species tends to result from adaptive radiation, it may be reasonable to suggest that earlier diversification events involved the same process and perhaps e ...
Quality assurance for computed-tomography simulators and the
... 共Quality assurance for clinical radiotherapy treatment planning兲. The aim of the current task group was not to duplicate material presented in the other two reports, but to develop a set of QA guidelines specific to CT-simulation, and to complement the recommendations presented in the other two repo ...
... 共Quality assurance for clinical radiotherapy treatment planning兲. The aim of the current task group was not to duplicate material presented in the other two reports, but to develop a set of QA guidelines specific to CT-simulation, and to complement the recommendations presented in the other two repo ...
The Modern Technology of Radiation Oncology, Vol. 1
... evolving technologies and, thus, provides a comprehensive overview. Anyone embarking on any of these new procedures will be able to gain some basic insight as to what is required to make that procedure clinically viable. Nowhere can all these technologies be found in one cancer therapy center. Howev ...
... evolving technologies and, thus, provides a comprehensive overview. Anyone embarking on any of these new procedures will be able to gain some basic insight as to what is required to make that procedure clinically viable. Nowhere can all these technologies be found in one cancer therapy center. Howev ...
2011 SCCT guidelines on radiation dose and dose
... imaging requirements, which should be tailored to provide only the information necessary for diagnosis. It is important to note that a tailored examination for noncoronary cardiovascular CT frequently does not meet the requirements for adequate evaluation of the coronary arteries. Despite lower radi ...
... imaging requirements, which should be tailored to provide only the information necessary for diagnosis. It is important to note that a tailored examination for noncoronary cardiovascular CT frequently does not meet the requirements for adequate evaluation of the coronary arteries. Despite lower radi ...
Chapter 4732 X-ray Definitions: Proposed Revisions to 4732.0110
... x-ray tube installed in an enclosure independent of existing architectural structure except the floor on which it may be placed. The cabinet x-ray system is intended to: ...
... x-ray tube installed in an enclosure independent of existing architectural structure except the floor on which it may be placed. The cabinet x-ray system is intended to: ...
Image Guided Patient Setup
... on how to further develop these products. The treatment plan for external beam radiotherapy is typically based on the anatomy presented in the planning CT scan data set (either with or without additional imaging modalities) being no more than a snapshot in time. In fact, the traditional simulation p ...
... on how to further develop these products. The treatment plan for external beam radiotherapy is typically based on the anatomy presented in the planning CT scan data set (either with or without additional imaging modalities) being no more than a snapshot in time. In fact, the traditional simulation p ...
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 ...
Guideline for Radiation Safety in Interventional Cardiology - J
... physicians have generally not been well aware of radiationinduced skin injuries, possibly because of their interest mainly in life-threatening diseases such as ischemic heart disease and arrhythmias. Interventional cardiology has become increasingly sophisticated, and the indications for it have exp ...
... physicians have generally not been well aware of radiationinduced skin injuries, possibly because of their interest mainly in life-threatening diseases such as ischemic heart disease and arrhythmias. Interventional cardiology has become increasingly sophisticated, and the indications for it have exp ...
Verification and correction of geometrical uncertainties in
... total deviation in a given fraction is presented by the sum of the recurring systematic error and an additional, fraction specific error. These fraction-to-fraction variations are called random errors and they represent the fluctuating component of the total error. Random errors are often characteri ...
... total deviation in a given fraction is presented by the sum of the recurring systematic error and an additional, fraction specific error. These fraction-to-fraction variations are called random errors and they represent the fluctuating component of the total error. Random errors are often characteri ...
Computed Tomography Radiation Safety Issues in Ontario
... and treatment of a variety of conditions because it allows high-resolution threedimensional images to be acquired very quickly. Therefore, the use of CT has increased substantially over the past decade, resulting in growing concern over the radiation dose from CT. CT technological advances, such as ...
... and treatment of a variety of conditions because it allows high-resolution threedimensional images to be acquired very quickly. Therefore, the use of CT has increased substantially over the past decade, resulting in growing concern over the radiation dose from CT. CT technological advances, such as ...
Medical Physics Department
... This report addresses the medical physics professional practice at TOH and also summarises the operational activities of the radiation oncology medical physics group. Imaging Physicists at TOH are specialized in nuclear medicine, nuclear cardiology and magnetic resonance imaging, providing clinical ...
... This report addresses the medical physics professional practice at TOH and also summarises the operational activities of the radiation oncology medical physics group. Imaging Physicists at TOH are specialized in nuclear medicine, nuclear cardiology and magnetic resonance imaging, providing clinical ...
6 The Simulation Process in the Determination and Definition of the
... hand, historically designed with diagnostic radiology needs in mind, with little or no concern for radiation therapy needs. A compounding factor to this problem is that scanner characteristics which are extremely important in radiotherapy are often not a significant concern or not needed in diagnost ...
... hand, historically designed with diagnostic radiology needs in mind, with little or no concern for radiation therapy needs. A compounding factor to this problem is that scanner characteristics which are extremely important in radiotherapy are often not a significant concern or not needed in diagnost ...
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.