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38 Cards in this Set
- Front
- Back
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Ripple in
1) constant 2) three phase 6 pulse 3) three phase 12 pulse |
1) ~0%
2) 5-10% 3) 4% |
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Tungsten k edge
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70 KeV
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increase of mAs of 100% is equal to what increase of kVp
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15%
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Fluoroscopy x ray tube currents
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1-6 mA
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Radiography/CT xray tube currents
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~100s mA
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Focal spot in CR
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Small 0.6 mm
Large 1.2 mm |
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Typical anode angle
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15 degrees
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At what energy are photon and compton equal
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25 keV
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Screen film needs how many uGy to blacken?
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5 uGy
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Entrance Air Kerma for
1) chest 2) skull 3) abdomen |
1. 0.1mGy
2. 1.5 mGy 3. 3 mGy |
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State regualtions for HVL
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>2.5 mm Al at 80 kVp
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OD of the following values allows what percentage of light to pass through
OD 1 OD 2 OD 3 |
1 = 10%
2 = 1% 3 = 0.1% |
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Bucky Factor for mammo
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2:1
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Bucky factor for CR
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5:1
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Grid ratio for mammo
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5:1
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Grid ration for normal CR
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10-12:1
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Bits in a byte
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8
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how many gray levels in 8 bits
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256
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How many MB do the following images take up
1) CXR 2) Single Mammo image 3) Digital photospot 4) MR (single slice) |
1) CXR 10 MB
2) Mammo 24 MB 3) Digital photospot 2 MB 4) MR 1/8th mammo |
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Resolution of
1) Screen/film 2) CR 3) Digital Mammo 4) Conventional Mammo 5) Fluoro 6) CT 7) MR |
1) Screen film 5 lp/mm
2) Digital CR 3 lp/mm 3) Digital Mammo 7 lp/mm 4) Conv Mammo 15 lp/mm 5) Fluoro 1 lp/mm 6) CT 0.7 lp/mm 7) MR 0.3 lp/mm |
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Occupational Dose Limit (whole body)
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50 mSv/y
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Occupational Dose Limit
(Skin/extremity/any organ other than eye) |
500 mSv/y
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Occupational Dose limit (eye)
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150 mSv/y
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Dose limit to general public
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1 mSv/y
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Dose limit to fetus
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0.5 mSv/ month or 5 mSv entire pregnancy
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Doubling dose for hereditary effects
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1 Gy
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Dose to cause skin erythema
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2 Gy
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Half life of Tc
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6 h
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LD 50/60 for adults
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~ 3.5 Gy
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Temporary Epilation
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3 Gy
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Permanet Epilation
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7 Gy
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Dose to cause catarct (acute and accumulative)
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accumulative 8 Gy
acute 4 Gy |
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Sterility in males (temporary and permanent)
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2.5 and 5 Gy
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Sterility in females
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1.5 and 6 Gy
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Dose needed for hematopoetic syndrome
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>2 Gy
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Dose needed for GI syndrome
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>10 Gy
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Dose needed for CV syndrome
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>50 Gy
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Most sensitive period for fetal development
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organogenesis (8-15 weeks)
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