RADPRO 3

25問 • 1年前

問題一覧

The fluoroscopic exposure control should be of the ____ ____ type

dead man

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

serves as a primary protective barrier and must be 2 mm Pb equivalent

Fluoroscopic image receptor assembly

_____ - 2.5mm Al ___ should be measured when filtration is unknown

1. Filtration 2. HVL

unexposed border should be visible at all heights above the tabletop

Automatic Collimators

unexposed border is visible on the image monitor (35 cm above the tabletop)

Rationale

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

It should be position between fluoroscopist & patient Equivalent: 0.25 mm Pb

Protective Curtain

- 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

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

If an optional high-level control: ___ mGy/min If there is no optional high-level control: ___ mGy/min during fluoroscopy.

1. 200 2. 100

________ _________ receive most of their occupational radiation exposure during _________

- Radiologic technologists - Fluoroscopy

where lead bonded to sheet rock or wood panelling is used in

Primary Barrier

results when the useful beam intercepts any objects causing some x-rays to be scattered

Scatter Radiation

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

depends on the distance between the source of radiation & the barrier

Distance

the use of the area that is being protected

Occupancy

Under Control: _________ _____: an area occupied primarily by radiology personnel & patients Limits: less than ___ mrem/week or 1 mSv/week

1. Controlled Area 2. 100

product of the maximum mA & the number of x-ray examinations performed per week (expressed in mAmin/week)

Workload

The percentage of time during which the x-ray beam is on & directed toward a particular protective barrier

Use Factor

___: It is used as a measure of penetrability General Radiography: ___ kVp Mammography: ___ kVp

1. kVp 2. 100 3. 30

6 Factors that affect Barrier Thickness DOCWUK

> Distance > Occupancy > Control > Workload > Use Factor > kVp

2 Alternative for lead

- Concrete or Concrete Block - Brick

4 inches of masonry is equivalent to ______ of lead.

1/16 inch

____ of masonry is equivalent to 1/16 inch of lead.

4 inches

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