RAD 231 - Week 2 Review

In digital fluoroscopy, the image must be turned into digital form by what device?

• Digital to analog converter (DAC)

• Flux capacitor

• Analog to digital converter (ADC)

• DVD-ROM

The feature that automatically adjusts kVp and mA during fluoroscopy is called:

• AEC

• ABC

• DQE

• SNR

The number of mAs used for conventional fluoroscopy is:

• 300 to 500

• 3 to 5

• 10 to 12

• 100 to 300

A primary advantage to digital fluoroscopy is:

• Postprocessing manipulation of the image

• Radiation dose to the patient is substantially lower

• No radiologist is needed

• Lower cost

Which photo-tissue interaction produces radiation that may expose others in the room during fluoroscopy?

• Compton

• Coherent

• Photoelectric

• Pair production

In many cases, digital fluoroscopy eliminates which of the following?

• The need for a radiographer

• Postprocedure "overhead" images

• Image acquisition

• Accurate positioning

ABC stands for:

• Automatic Bucky Center

• ALARA Backup Control

• Automatic Brightness Control

• Area Beam Collimator

A feature of fluoroscopic x-ray machines that automatically adjusts kVp and mA so as to maintain:

• Automatic imaging

• Automatic brightness control (ABC)

• Automatic image processing

• Constant exposure output

If the dose of scatter radiation in fluoroscopy to the radiographer is 10 mGy_a at a distance of 2 feet from the table, where should the radiographer stand to reduce the dose to 2.5 mGy_a?

• 8 feet from the table

• 4 feet from the table

• at the foot of the table

• directly behind the fluoroscopist

The latest digital fluoroscopic units use:

• Nonionizing radiation

• CR cassettes

• conventional image intensifiers

• flat panel plates similar to DR