Committee Opinion, Number 656, February 2016, Guidelines
... should not be withheld if clinically indicated, but a thorough discussion of risks and benefits should take place (8). In the evaluation for acute processes such as appendicitis or small-bowel obstruction, the maternal benefit from early and accurate diagnosis may outweigh the theoretical fetal risk ...
... should not be withheld if clinically indicated, but a thorough discussion of risks and benefits should take place (8). In the evaluation for acute processes such as appendicitis or small-bowel obstruction, the maternal benefit from early and accurate diagnosis may outweigh the theoretical fetal risk ...
Accelerator integrated cone beam systems for verification imaging
... Image quality control tests results can be extracted from a single image acquisition of a standard CT image quality phantom. Manufacturers typically supply such phantoms as part of the purchase. Users are strongly recommended to follow exactly the instructions from the manufacturer’s Customer Accept ...
... Image quality control tests results can be extracted from a single image acquisition of a standard CT image quality phantom. Manufacturers typically supply such phantoms as part of the purchase. Users are strongly recommended to follow exactly the instructions from the manufacturer’s Customer Accept ...
Cardiovascular Imaging With Computed Tomography
... Based on individualized review of the clinical indication, the patient is directed toward the most appropriate diagnostic test or strategy. For a specific imaging modality, the image acquisition protocol is adjusted on the basis of the suspected condition, pre-test probability, patient criteria, and ...
... Based on individualized review of the clinical indication, the patient is directed toward the most appropriate diagnostic test or strategy. For a specific imaging modality, the image acquisition protocol is adjusted on the basis of the suspected condition, pre-test probability, patient criteria, and ...
MODALITY CAPSULE REVIEWS Diffusion
... predictive of a node negative specimen. Obviously the sensitivity of this finding is low, because one can still have and see LN by DWI which could still be benign. Staging/Restaging: Quantitative evaluation (i.e. ADC values) T-stage: Several investigators have reported a correlation between low ADC ...
... predictive of a node negative specimen. Obviously the sensitivity of this finding is low, because one can still have and see LN by DWI which could still be benign. Staging/Restaging: Quantitative evaluation (i.e. ADC values) T-stage: Several investigators have reported a correlation between low ADC ...
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... 10. d. Panoramic radiography became popular in the 1960s with the introduction of the panoramic x-ray machine. 11. c. While cone beam volumetric imaging dedicated to dental applications produces less radiation doses than conventional CT scans, the dose is still 4 to 15 times that required for a pano ...
... 10. d. Panoramic radiography became popular in the 1960s with the introduction of the panoramic x-ray machine. 11. c. While cone beam volumetric imaging dedicated to dental applications produces less radiation doses than conventional CT scans, the dose is still 4 to 15 times that required for a pano ...
Imaging In Pregnancy Jamal Alkoteesh Consultant &Head of Interventional Radiology
... • High doses of radiation can cause damage to the central nervous system, especially between 8 and 15 weeks gestation. • It is believed, that significant exposure resulting in cell death or damage prior to 8 weeks gestation (which is the first 6 weeks after conception) produces an all or none effect ...
... • High doses of radiation can cause damage to the central nervous system, especially between 8 and 15 weeks gestation. • It is believed, that significant exposure resulting in cell death or damage prior to 8 weeks gestation (which is the first 6 weeks after conception) produces an all or none effect ...
Assessment of absorbed dose in critical organs in OPG: a phantom
... increasing worldwide over the past few decades which might be due to increased detection using more sensitive diagnostic procedures. The known risk factors for thyroid cancer include being female, having anenlarged thyroid or thyroid nodules, family history of thyroid cancer and radiation exposure e ...
... increasing worldwide over the past few decades which might be due to increased detection using more sensitive diagnostic procedures. The known risk factors for thyroid cancer include being female, having anenlarged thyroid or thyroid nodules, family history of thyroid cancer and radiation exposure e ...
Dynamic Targeting IGRT What`s Next?
... tumor is, we have to be all the more diligent in knowing exactly where the tumor is, every day.” Dynamic Targeting IGRT addresses this clinical challenge. It is an approach that uses patient positioning devices and imaging tools to target tumors more precisely. Dynamic Targeting IGRT helps clinician ...
... tumor is, we have to be all the more diligent in knowing exactly where the tumor is, every day.” Dynamic Targeting IGRT addresses this clinical challenge. It is an approach that uses patient positioning devices and imaging tools to target tumors more precisely. Dynamic Targeting IGRT helps clinician ...
Influence of CBCT exposure conditions on radiation dose
... dose time fixed, will result in reduced radiation dose. Another way to reduce radiation dose is by altering collimation and filtration judiciously. In conventional fanbeam CT and CBCT machines, which take numerous x-ray projections, another principle applies, namely that the more projections there are ...
... dose time fixed, will result in reduced radiation dose. Another way to reduce radiation dose is by altering collimation and filtration judiciously. In conventional fanbeam CT and CBCT machines, which take numerous x-ray projections, another principle applies, namely that the more projections there are ...
Descarge la noticia
... patient, its potential severity, the ability of CT to detect and characterize or stage the disease, the impact of alternative therapies, potential impacts of false negative and false positive exams, and the risk of not obtaining a CT exam. Radiologists can answer questions about test performance and ...
... patient, its potential severity, the ability of CT to detect and characterize or stage the disease, the impact of alternative therapies, potential impacts of false negative and false positive exams, and the risk of not obtaining a CT exam. Radiologists can answer questions about test performance and ...
Tomotherapy: A "Revolution" in Radiation Therapy
... linear accelerator is slightly detuned leading to a maximum electron energy at the target of 3.5 rather than 6 MeV. While the schematic in Figure 6 shows both megavoltage and kilovoltage imaging capabilities, the first helical tomotherapy units will not incorporate the kilovoltage capabilities. Thes ...
... linear accelerator is slightly detuned leading to a maximum electron energy at the target of 3.5 rather than 6 MeV. While the schematic in Figure 6 shows both megavoltage and kilovoltage imaging capabilities, the first helical tomotherapy units will not incorporate the kilovoltage capabilities. Thes ...
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.