Unit 3 - QC & QA

How often should you check Exposure Timer Accuracy?

Annually

What is the Acceptable Range of Exposure Timer Accuracy?

• or - 5%

How often should you check mA Linearity?

Annually

What is the Acceptable Range of mA Linearity?

• or - 10% of variation

How often should you check Exposure Reproducability?

Annually

What is the Acceptable Range of Exposure Reproducability?

• or - 5%

How often should you check Kilovoltage Peak Calibration?

Annually

What is the Acceptable Range of Kilovoltage Peak Calibration?

• or - 5%

How often should you check Half-Value Layer / Filtration?

Annually

What is the Acceptable Range of Half-Value Layer / Filtration?

Exceed required minimum (amount of thickness of absorber material "usually aluminum" needed to reduce the intensity of the x-ray beam to one-half of the original)

How often should you check Collimation?

Semi-Annually

What is the Acceptable Range of Collimation?

• or - 2% of the SID

How often should you check Vertical Beam Alignment?

Semi-Annually

What is the Acceptable Range of Vertical Beam Alignment?

• or - 2 degrees from vertical

How often should you check Focal Spot Size / Condition?

Annually

What is the Acceptable Range of Focal Spot Size / Condition?

• or - 50% of nominal size

How often should you check the Image Receptor System?

Semi-Annually

What is the Acceptable Range of a Image Receptor System?

Zero visible defects

How often should you check the Automatic Exposure Control?

Annually

What is the Acceptable Range of the Automatic Exposure Control?

• or - 10%

With HVL, the higher the HVL of an x-ray beam, the _____ penetrating the beam

more

Acceptance testing of x-ray equipment is performed by a ______ prior to daily use.

medical physicist

In medical imaging departments with a quality control program in place, the great majority of repeated exposures are due to improper:

Positioning

The device (provided by many manufacturers of display monitors) designed to directly measure luminance, or the light intensity emitted from a display monitor, is the:

Photometer

Determining how consistently radiologists' image interpretations match ultimate patient diagnosis is called ____.

outcome assessment/analysis

T/F: Quality control refers to the calibration and monitoring of equipment.

True

The minimum source-to-table distance for stationary fluoroscopy units is:

15 inches

The minimum source-to-table distance for mobile fluoroscopy units is:

12 inches

The ability to be given a negative diagnosis when no disease is present is termed:

specificity

The ability to detect disease is termed:

sensitivity