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Rad Protection Ch.13
Compurted Tomography & mammograms
| Question | Answer |
|---|---|
| Because _____ uses multiple slices during images and the x-rays do not "cut off" at the edge of the slice, there are some overlap and therefore and increased in exposure to that area. | CT. |
| Direct Patient Shielding | - Not typically used in CT. - Rotational nature of exposure. - Beam tightly collimated to the slice. - Generally, in CT, anatomy does not appear in the primary beam unless it is part of the intended field of view. |
| Spiral, or helical, CT | - Presents a greater challenge for assessing patient dose. - Spiral scan pitch ratio. |
| _____ reduces patient dose because the x-rays are spread out over a larger area or the movement of the patient through the beam is quicker. | Higher pitch. |
| Tube Current Modulation | - Compared to Automatic Exposure Control in radiographic imaging. - Reduces the amount of radiation through areas which do not require as much exposure. - Based off of the "scout view. |
| In order to approximate the effective radiation dose to a patient who has undergone a CT study the following CT dose parameters need to be determined: | - CT dose index (CTDI). - CTDIw. - CTDIVOL. - Dose length product (DLP). |
| Mammography | Is used to detect breast cancer that is not palpable in physical examinations. |
| Patient Dose in Mammography | - Age considerations for mammography. - Mean dose to the glandular tissue of a 4.5-cm compressed breast using a screen-film or digital mammography system per FDA should not exceed per view 3 mGyt . - Benefit of digital mammography units. |
| Mammography Screening | - American College of Radiology (ACR), American Cancer Society (ACS), and American Medical Association (AMA) advocate annual screening at least every other year for women age 40 to 49 years. |
| Filtration for Mammographic Equipment | Molybdenum or Rhodium filter. |
| Dose reduction on mammography can be achieved by limiting the number of projections taken. | - For routine screening procedure, it is prudent to perform only craniocaudal and mediolateral projections of each breast with adequate compression to demonstrate breast tissue uniformly from the nipple to the most posterior portion. |
Created by:
sassyrad
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