Test Equipment for Radiology and CT Quality Control

Search:  
Username: Password:

Education HC Safety Code 35 QC for CT

 

 

 

Safety Code 35 Summary

Quality Control Procedures

CT

For more detail about each quality control procedure

select the relevant link in the tables below

 

 

Daily Quality Control Tests

 

Quality Control Procedures

CT System

 

 

Equipment Warm-up

D1

Meters Operation

D2

Equipment Conditions

D3

Overall Visual Assessment of Electronic Display Devices

D7

 

Normal Font – Required Tests               Italics - Recommended

 

May 2010

 

Abbreviations used

 

FS Film-Screen

CR Computed Radiography

DR Digital radiography

RS Radioscopy (Fluoroscopy and Angiography)

CT Computed Tomography

SF Spot Film or Acquisition

CT Quality Control Tests

 

Quality Control Procedures

Link

CT System

 

Weekly QC Tests

Visual Inspection of Cleanliness of Imaging Systems

W1-CT

Clean annular window

CT Number Accuracy

W4

Check CT number water 0 ± 4 HU 

CT Noise

W5

Image noise in centre of water phantom ± 10% from baseline value

CT Uniformity

W6

Check CT number in centre and 4 quadrants ± 5HU

Follow up ± 2HU from baseline value

Viewbox Condition

W2

Cleanliness, luminance

Laser Film Printer Operation

W3

Print pattern such as SMPTE

Monthly QC Tests

 

 

Electronic Display Devices Performance

M6

All devices used to display digital images – use SMPTE pattern

Laser Film Printer Operation

M7

- Print pattern such as SMPTE

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

- Measure OD of 10% to 90% patches

- No artifacts or geometrical distortion greater than 1mm

CT Tomographic Section Thickness

M8

Slice thickness should be ± 50% if SW over 1 mm

Slice thickness should be ± 0.5 mm if SW under 1 mm

Calibration of CT Number

M9

Check CT number water 0 ± 4 HU  and air -1000 ± 10 HU 

CT Number Linearity

M10

Check CT number over CT range -1000 to +1000

Quarterly QC Tests

 

 

Interlocks

Q2

Check door interlocks (if present)

CT Patient Support Movement

Q8

Check table movement corresponds to digital display ±1 mm

CT Spatial Resolution

Q9

Measure MTF or line pair phantom

CT Low Contrast Detectability

Q10

Smallest object which can be visualized

Semi-annual QC Tests

CT Laser Light Accuracy

SY1

Check laser light vs X-ray beam with phantom

CT Accuracy of Automatic Positioning of Tomographic Plane (using the scanned projection radiograph)

SY2

Check localization scan corresponds to digital display ±2 mm

CT Accuracy of Gantry Tilt

SY3

 Accuracy of gantry tilt angle

CT Patient Dose

SY4

Check CTDI ± 20% from baseline values

Annual QC Tests

 

 

   

 

CT Number Dependence on Phantom Position

Y23

Check CT number water 0 ± 5 HU  for possible patient positions in the gantry

CT Radiation Dose Profile

Y24

Variation of the intensity of the X-ray beam in the Z plane

CT Radiation Dose—Scout Localisation Image

Y25

Radiation Dose for Localisation Image within 20% of baseline value

Viewboxes

Y26

Check luminance, uniformity, homogeneity, ambient light

Electronic Display Device Performance

Y27

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

Integrity of Protective Equipment

Y28

Any protective equipment must be checked

General Preventive Maintenance

Y29

Biomed PMs must be performed