Test Equipment for Radiology and CT Quality Control

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Education HC Safety Code 35 QC for Radiography

 

Safety Code 35 Summary

Quality Control Procedures

Radiography/CR/DR

 

For more detail about each quality control procedure

select the relevant link in the tables below

 

 

Daily Quality Control Tests

 

Quality Control Procedures

Film

CR System

DR System

 

 

 

 

Equipment Warm-up

D1

D1

D1

Meters Operation

D2

D2

D2

Equipment Conditions

D3

D3

D3

Darkroom Cleanliness

D5

 

 

Film Processor Function

D6

 

 

Overall Visual Assessment of Electronic Display Devices

D7

D7

D7

 

Normal Font – Required Tests               Italics - Recommended

 

Abbreviations used

 

FS Film-Screen

CR Computed Radiography

DR Digital radiography

RS Radioscopy (Fluoroscopy and Angiography)

CT Computed Tomography

SF Spot Film or Acquisition

 

 

Radiographic QC Tests

 

Quality Control Procedures

Film

CR

DR 

Comments

 

 

Weekly Quality Control Tests

Visual Inspection of Cleanliness of Imaging Systems

W1-FS

W1-CR

W1-DR

Inspect screens/CR plates/DR housing

Viewbox Condition

W2

W2

W2

Cleanliness, luminance

Laser Film Printer Operation

 

W3  

W3

Print pattern such as SMPTE

 

 

 

 

 

Monthly Quality Control Tests

 

 

 

 

Cassette, Screen, and Imaging Plate Cleaning

M1-FS

M1-CR

 

Clean screens/CR plates/DR housing

Darkroom Temperature and Humidity Conditions

M2

 

 

Temp: 18-23C; Humidity 40-60%

Darkroom Light Conditions

M3

 

 

Check for light tightness

Film Processor Operation

M4

 

 

Temp ± 0.5C; Developer and fixer correct

Retake Analysis

M5

M5

M5

For film, collect discards; for CR and DR use manufacturers software

Electronic Display Device Performance

M6

M6  

M6

Display pattern such as SMPTE on all image display stations

Laser Film Printer Operation

 

M7

M7

- Print pattern such as SMPTE

- Check for 0/5% and 95/100% patch visibility

- Optical Density of 10% to 90% patches

- No artifacts or geometrical distortion greater than 1mm

 

 

 

 

 

Quarterly Quality Control Tests

 

 

 

 

Collimator Operation

Q1

Q1

Q1

Ensure smooth operation

Interlocks

Q2  

Q2

Q2

Check function of any interlocks

Radiographic Annual QC Tests

 

Quality Control Procedures

Film

CR

DR

Comments

Performance

 

 

 

 

Safelight Test

Y1

 

 

 

Film/Screen Contact

Y2

 

 

 

Accuracy of Loading Factors

Y3-RD

Y3-RD

Y3-RD

mAs Linearity

Radiation Output Reproducibility

Y4-RD

Y4-RD

 

Y4-RD

Reproducibility

Radiation Output Linearity

Y5-RD

Y5-RD

Y5-RD

Output with mAs

X-ray Beam Filtration

Y6-RD

Y6-RD

Y6-RD

HVL

Automatic Exposure Control

Y7-FS

Y7-CR

Y7-DR

Check AEC for all kVps and thicknesses

X-ray Field and Light Field Alignment

Y8-9

Y8-9

Y8-9

  

Congruency of x-ray beam and light field edges

X-ray Beam Collimation

Y8-9

 

Y8-9

 

Y8-9

  

Light and X-ray field alignment

Image Quality

 

 

 

 

Grid Performance

Y10

Y10

Y10

Check uniformity and movement of grid

Response Function

 

Y11-CR

Y11-DR

Variation of mean pixel value with dose

Exposure Index

 

Y11-CR

Y11-DR

Exposure Index versus Dose 1 to 50 mGy

Dynamic Range

Y13-FS

Y11-CR

Y11-DR

 Range of contrast visible in an image

Noise, Uniformity and Image Artifacts

 

Y11-CR

Y11-DR

 

For above range of dose measure noise in center and each quadrant

Check for artifacts

Spatial Resolution

Y15

Y15

 

Y15

Line-pair or Leeds phantom

Contrast Detectability

Y13-FS

Y11-CR

 

Y11-DR

Leeds phantom 

Digital Detector Residual Images

 

Y11-CR

 

Y11-DR

 

Take image at 50 mGy then zero;

check for artifacts

Phantom Dose Measurements

Y18

Y18

Y18

 

Measure dose at surface of standard phantom eg 20 cm PMMA

Other

 

 

 

 

Viewboxes

Y26

Y26

Y26

Check luminance, uniformity, homogeneity, ambient light

Electronic Display Device Performance

 

Y27

Y27

 

All clinical workstations must be calibrated  for luminance, distortion, resolution and noise

Integrity of Protective Equipment

Y28

Y28

Y28

Lead aprons, integral shielding

General Preventive Maintenance

Y29

Y29

Y29

As per manufacturer

DAP Meter

Y30

Y30

Y30

Calibrate if fitted