FREE RADIOLOGY AND STUDY GAMES ABOUT RAD 231 -

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FREE RADIOLOGY AND STUDY GAMES ABOUT RAD 231 -

UNIT 4 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -70 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is a portable xray generator?

Answer:

can be carried ex...military battlefield use

Question 2: Describe the purpose of the Generator Linearity test.

Answer:

To assure that sequential increases in milliampere-seconds produce the same sequential increase in exposure.

Question 3: What is the purpose of PBL?

PP p18 Papp p113-114

Answer:

Automatic collimation regulates the size of the x-ray exposure field; significant role in determining patient dose; impacts image contrast (more or less scatter based on amt of anatomy exposed)

Question 4: What is the purpose of QC - performance testing of radiographic equipment?

Answer:

measures radiation output

Question 5: Which test measures x-ray/light field congruency?

Answer:

• (9) penny collimator test

Question 6: When performing a visual inspection, what do you need to check?

Papp p101

Answer:

Inspect the control console, overhead tube crane, radiographic table, protective lead apparel, and miscellaneous equipment

Question 7: What is the process of TROUBLESHOOTING?

PP p4

Answer:

IMPORTANT - saves money by reducing unnecessary service calls;

• Trace the problem

• Finding a cause

• Taking the appropriate action

Question 8: What happens to image quality if beam alignment fails?

Answer:

• shape distortion

• must repeat study (increase patient dose)

Question 9: What is the purpose of the Generator - Reproducibility test?

Answer:

To assure that exposure received for the same mAs and kVp is the same from exposure to exposure.

Question 10: What is Phase 2 Troubleshooting?

Answer:

-Develop a medium to convey troubleshooting communications.*post a troubleshooting list in each room *include in new employee orientation

Question 11: KNOW

What formula do you use to calculate time for half-wave time?

Answer:

count number of dots / 60 = time; 60 cycles per second (1 per complete sine wave)

Question 12: What is the purpose of measuring timer accuracy?

Answer:

accurate exposure timer measurements are critical for acquiring properly exposed images with ALARA

Question 13: What are the three components of QC for radiographic units?

Answer:

Visual Inspection - p101 Papp; Environmental Inspection - p102 Papp; Performance Testing - p103 Papp

Question 14: What does the Reproducibility of Exposure test evaluate?

Papp p104

Answer:

x-ray generator - a specific technique always produces the same radiation output

Question 15: What is the formula for the Reproducibility of Exposure

Answer:

(exposure or air kerma max - exposure or air kerma min) / (exposure of air kerma max + exposure or air kerma min) X 100 OR (exposure or air kerma max - exposure or air kerma min) / 2 then divide that answer by the average of the measured air kerma X 100

Question 16: Describe TYPES of tools used for radiation measurement.

PP p8 Papp p103-104

Answer:

Most performance testing performed with gas-filled chamber detectors

• diff types of detectors

*ion chamber (most common) DOSIMETER *Proportional counter (nuc med) (drop into well, counts) *Geiger-Mueller counter (nuc med) (survey meter) Question 17: State the name of the test that measures how much low energy radiation is in the x-ray beam.PP p10 QC Packet #3

Answer:

Beam Quality Test - Filter Ratio Method

Question 18: What tools are needed for the Filter Ratio method test?

Answer:

Dosimeter, sheets of lead rubber, sponges and 2.3mm Aluminum filtration

Question 19: What are the grid variables?

PP p32

Answer:

grid UNIFORMITY; grid ALIGNMENT

Question 20: What equipment is needed for the Generator - reproducibility test?

Answer:

dosimeter sheets of lead rubber

Question 21: What are the acceptance limits for the generator linearity test?

Papp p111

Answer:

federal regulations state that the linearity should not exceed +/- 10%.

Problems in the x-ray generator, such as timer circuitry, or rectifier failure, can cause the linearity variance to exceed accepted limits.