1radiation dose is measured in__?
Gyt
2radiation exposure is measured in__?
Gya
3Occupational exposure is measured in__?
Sv
4radiation dose to patients is measured in__?
Gyt
5Exposure refers to radiation___?
intensity in air
6dose measures the ___?
energy absorbed
7What does effective dose refer to?
biologic effectiveness of radiation energy absorbed
8effective dose is measured in?
Rem/Sv
9What are the two places in medical imaging with high occupational exposure
Fluoro/Interventional
10where are the two places in medical imaging with low occupational exposure
Mammo/CT
11monitoring devices are only required for?
radiologic technologists or any personnel that are exposed to radiation on a daily basis
12operating C-arm can result in what?
high occupational exposure
13x-ray tube should be where doing c-arm procedures
under patient to reduce tech exposure
14patient dose can be reported as?
Entrance Skin Exposure
Gonadal dose
Bone Marrow
15bone marrow also known as?
mean marrow dose
16What does entrance skin exposure(ESE) refer to?
patient dose
17what is mean marrow dose
average radiation dose to the entire active bone marrow
18why is gonadal dose important
because of suspected genetic effects of radiation
19what is genetically significant dose (GSD)
an index of radiation recieved by gene pool
20For mammo, gonadal dose (GD) should not exceed? how about for using a grid?
100mrad/view
300 mrad/view
21how does CT dose compare to routine x-ray procedures
slightly higher dose
22CT uses what kind of collimation?
pin point collimation only irradiates a well defined volume of tissue
23how much mrad for head ct? for body?
3000-5000mrad
2000-4000mrad
243 ways to reduce dose by adjustments in CT?
pitch
slice thickness
technical factors (kVp, mA)
25when would occupational radiation monitoring be required
if individual could likely recieve more than 1/10 of dose limit
26what must occupational radiation monitoring report always include?
Current exposure
cumulative annual exposure
27what is the best way to hold patient for an exam
restraining devices
28when is CXR for TB screening reasonable
high risk groups
29what is the avg amount of all exams repeated
5-10%
30when should gonad shielding be used?
potentially reproductive patients
gonads lie in or near useful beam
should not interfere with area of interest