問題一覧
1
The fluoroscopic exposure control should be of the ____ ____ type
dead man
2
Source to ____ Distance SSD must NOT BE LESS than __ cm on stationary fluoroscopes SSD must NOT BE LESS than __ cm on mobile fluoroscopes. Increased SSD: reduces entrance ____ exposure
1. Skin 2. 38 3. 30 4. skin
3
serves as a primary protective barrier and must be 2 mm Pb equivalent
Fluoroscopic image receptor assembly
4
_____ - 2.5mm Al ___ should be measured when filtration is unknown
1. Filtration 2. HVL
5
unexposed border should be visible at all heights above the tabletop
Automatic Collimators
6
unexposed border is visible on the image monitor (35 cm above the tabletop)
Rationale
7
moved at the end of the table during fluoroscopy leaving a 5 cm opening in the side of the table and Covered with ____ mm Pb
Bucky Tray 0.25
8
It should be position between fluoroscopist & patient Equivalent: 0.25 mm Pb
Protective Curtain
9
- produces an audible sound when the fluoroscopic time has exceeded _ minutes - Designed to ensure that the radiologist is aware of the relative beam-on time during each procedure
Cumulative Timer - 5 minutes
10
The intensity of the x-ray beam at the tabletop of a fluoroscopy should not exceed ___ mGy/min for each mA of operation at ___ kVp
2.1 80
11
If an optional high-level control: ___ mGy/min If there is no optional high-level control: ___ mGy/min during fluoroscopy.
1. 200 2. 100
12
________ _________ receive most of their occupational radiation exposure during _________
- Radiologic technologists - Fluoroscopy
13
where lead bonded to sheet rock or wood panelling is used in
Primary Barrier
14
results when the useful beam intercepts any objects causing some x-rays to be scattered
Scatter Radiation
15
Radiation emitted from the x-ray tube housing in all directions other than that of the useful beam Limit: ___ mR/hr at 1 m
1. Leakage Radiation 2. 100
16
depends on the distance between the source of radiation & the barrier
Distance
17
the use of the area that is being protected
Occupancy
18
Under Control: _________ _____: an area occupied primarily by radiology personnel & patients Limits: less than ___ mrem/week or 1 mSv/week
1. Controlled Area 2. 100
19
product of the maximum mA & the number of x-ray examinations performed per week (expressed in mAmin/week)
Workload
20
The percentage of time during which the x-ray beam is on & directed toward a particular protective barrier
Use Factor
21
___: It is used as a measure of penetrability General Radiography: ___ kVp Mammography: ___ kVp
1. kVp 2. 100 3. 30
22
6 Factors that affect Barrier Thickness DOCWUK
> Distance > Occupancy > Control > Workload > Use Factor > kVp
23
2 Alternative for lead
- Concrete or Concrete Block - Brick
24
4 inches of masonry is equivalent to ______ of lead.
1/16 inch
25
____ of masonry is equivalent to 1/16 inch of lead.
4 inches