CT Dose Summit 2011
... time – mA X rotation time (typically 0.5 seconds) – Depends on patient size and clinical indication ...
... time – mA X rotation time (typically 0.5 seconds) – Depends on patient size and clinical indication ...
CT Dose Summit 2011
... time – mA X rotation time (typically 0.5 seconds) – Depends on patient size and clinical indication ...
... time – mA X rotation time (typically 0.5 seconds) – Depends on patient size and clinical indication ...
Fluoroscopy and Radiation Safety Content for
... fluoroscopic images, but also limit the number of x‐rays used to form the image in the individual frame that increases the quantum mottle in the image. The need for a sharp image must be balanced against the need for more x‐rays to penetrate larger patients and properly manage the quantum mottle ...
... fluoroscopic images, but also limit the number of x‐rays used to form the image in the individual frame that increases the quantum mottle in the image. The need for a sharp image must be balanced against the need for more x‐rays to penetrate larger patients and properly manage the quantum mottle ...
Developing an Action..
... Abstract—Technological advances and increased utilization of medical testing and procedures have prompted greater attention to ensuring the patient safety of radiation use in the practice of adult cardiovascular medicine. In response, representatives from cardiovascular imaging societies, private pa ...
... Abstract—Technological advances and increased utilization of medical testing and procedures have prompted greater attention to ensuring the patient safety of radiation use in the practice of adult cardiovascular medicine. In response, representatives from cardiovascular imaging societies, private pa ...
radiation protection in diagnostic radiology - RPOP
... nice images can be obtained at double the dose or more and overexposures are not obvious unlike dark images in screen-film radiography. False – Only when features are utilized, not always. See the earlier question as an example. True – Additional consideration of image quality and dose ...
... nice images can be obtained at double the dose or more and overexposures are not obvious unlike dark images in screen-film radiography. False – Only when features are utilized, not always. See the earlier question as an example. True – Additional consideration of image quality and dose ...
Good Afternoon I am Bulent Aydogan and I will be Good Afternoon I
... EBT + chemotherapy; intracavitary brachytherapy; HR CTV is contoured: (a) Standard loading pattern: Coverage of HR CTV is insufficient; dose volume relations in organs at risk are appropriate. (b) Optimised treatment plan - NOT RECOMMENDED: By dragging the isodose line to the left, HR CTV is appropr ...
... EBT + chemotherapy; intracavitary brachytherapy; HR CTV is contoured: (a) Standard loading pattern: Coverage of HR CTV is insufficient; dose volume relations in organs at risk are appropriate. (b) Optimised treatment plan - NOT RECOMMENDED: By dragging the isodose line to the left, HR CTV is appropr ...
Chapter 15 SPECIAL PROCEDURES AND TECHNIQUES IN
... standard radiotherapy departments and clinics, several specialized techniques are known and used for special procedures, be it in dose delivery or target localization. These techniques deal with specific problems that usually require equipment modifications, special quality assurance procedures and ...
... standard radiotherapy departments and clinics, several specialized techniques are known and used for special procedures, be it in dose delivery or target localization. These techniques deal with specific problems that usually require equipment modifications, special quality assurance procedures and ...
guided radiation therapy
... Department of Radiation Oncology, William Beaumont Hospital, Royal Oak, MI Purpose: Geometric uncertainties in the process of radiation planning and delivery constrain dose escalation and induce normal tissue complications. An imaging system has been developed to generate high-resolution, softtissue ...
... Department of Radiation Oncology, William Beaumont Hospital, Royal Oak, MI Purpose: Geometric uncertainties in the process of radiation planning and delivery constrain dose escalation and induce normal tissue complications. An imaging system has been developed to generate high-resolution, softtissue ...
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 ...
Weightbearing CBCT, MDCT, and 2D imaging dosimetry of the foot
... visualization of separate bony structures [4, 5]; however, this examination is expensive, limited in availability to hospitals and large radiology practices, and is associated with significantly increased x-ray dose in relation to plain views. Cone Beam CT (CBCT) represents a less expensive alternat ...
... visualization of separate bony structures [4, 5]; however, this examination is expensive, limited in availability to hospitals and large radiology practices, and is associated with significantly increased x-ray dose in relation to plain views. Cone Beam CT (CBCT) represents a less expensive alternat ...
Special procedures and techniques in radiotherapy
... where I0, and I are the doses administered before and after the compensator is added, T(AR,dR) and T(A,d) are the TPRs or TMRs for the reference body section and the section to be compensated for equivalent fields AR and A at midline depths dR and d, OARd is the off-axis ratio at depth d relative to ...
... where I0, and I are the doses administered before and after the compensator is added, T(AR,dR) and T(A,d) are the TPRs or TMRs for the reference body section and the section to be compensated for equivalent fields AR and A at midline depths dR and d, OARd is the off-axis ratio at depth d relative to ...
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.