quality control for digital mammography · 2018. 4. 7. · fuji qc : test with 1shot phantom...
TRANSCRIPT
Quality Control for Digital Mammography
Chuttraporn Oatcharearnchai
Radiologic technologist
Maharaj Nakorn Chiangmai Hospital
OBJECTIVE
Reduce exposure to patients and personal
Consistent image quality
Detect and correct for potential problems, before they
impact image quality
Mammography Machine
FUJI GE
FUJI QC
Daily / Weekly Test
Equipment required : 1 shot phantom M plus
FUJI QC : Test with 1Shot Phantom (exposure)
1. Place 1 Shot phantom and chest wall edge to edge on the center of detector.
2. Place compression paddle 40 mm. above the detector.
40 mm.
FUJI QC : Menu registration and exposure menu selection.
1. Enter information.
2. Select [QC/TEST] in the exposure region list and [1Shot PhantomM] in the exposure menu list.
Press [QC] to display the QC window
FUJI QC : QC Software startup
FUJI QC : Exposure condition confirmation
Check the exposure conditions.
FUJI QC : Test with 1Shot Phantom (user input)
Press [User input]. Enter the visual inspection results. - Geometric distortion - Artifact
FUJI QC : Auto calculation and Test result confirmation
FUJI QC : Details of 1Shot phantom
1. Missed tissue on chest wall edge 2. CNR 3. 1Shot Phantom sensitivity constancy 4. Geometric distortion 5. System artifact evaluation 6. Uniformity 7. Dynamic range 8. Spatial Resolution (SR) 9. Low Contrast Detectability (LCD) 10.Linearity/Beam quality constancy
FUJI QC : 1. Missed tissue on chest wall edge
FUJI QC : 2. CNR
FUJI QC :
60 mm
3. 1Shot Phantom sensitivity constancy
FUJI QC : 4. Geomatic distortion
FUJI QC : 5. System artifact evaluation
FUJI QC : 6. Uniformity
FUJI QC : 7. Dynamic range
FUJI QC :
4lp/mm
8lp/mm
2lp/mm
8. Spatial Resolution
FUJI QC : 9. Low Contrast Detectability
FUJI QC : 10. Linearity
FUJI QC : RESULT
Daily Test ACR Phantom
Weekly Test FLAT FIELD TEST
PHANTOM IQ CNR AND MTF MEASUREMENT
GE QC
Monthly Test AOP MODE AND SNR CHECK
GE QC : ACR phantom
Daily Test
Equipment required : ACR phantom
GE QC : ACR phantom
1. Placed ACR phantom laterally centered and towards chest wall on the bucky.
2. Take 1 Exposure.
Procedure
GE QC : ACR phantom
Fiber : 3 Speak group : 3 Masses : 4
GE QC : FLAT FIELD TEST
Weekly Test
Equipment required : Flat field test object
GE QC : FLAT FIELD TEST
Brightness non-uniformity
High frequency modulation (HMF)
SNR non-uniformity
Bad ROI
Bad pixel verification
Objective
GE QC : FLAT FIELD TEST
1. Remove the bucky/breast holder and the compression paddle.
2. Placed the flat field device on the image receptor.
3. Take 2 Exposures.
Automatic parameters : large focal spot, MO/MO, 26 kV, 200 mAs.
Procedure
GE QC : FLAT FIELD TEST
GE QC : FLAT FIELD TEST
Mammographic Quality Control phantom : ACR phantom.
Weekly Test
GE QC : PHANTOM IQ
Equipment required
GE QC : PHANTOM IQ
Objective
Ensure adequate and consistent quality of image
acquired by the detector and displayed on the AWS
monitor and the printer
1. Install bucky and compression paddle.
2. Placed ACR phantom laterally centered and towards chest wall on the bucky.
4. Take 1 Exposure.
Automatic parameters : large focal spot, Rh/Rh, 29 kV, 56 mAs.
3. Compress the phantom.
GE QC : PHANTOM IQ
Procedure
GE QC : PHANTOM IQ
GE QC : PHANTOM IQ
GE QC : FLAT FIELD TEST
Weekly Test
GE QC : CNR AND MTF MEASUREMENT
Equipment required : IQST device
GE QC : CNR AND MTF MEASUREMENT
Objective
Contrast to noise ratio (CNR)
Modulation Transfer Function (MTF)
1. Install bucky and remove compression paddle.
2. Placed IQST device on the bucky in the field of view.
3. Take 1 Exposure.
Automatic parameters : Rh/Rh, 30 kV, 56 mAs.
GE QC : CNR AND MTF MEASUREMENT
Procedure
GE QC : CNR AND MTF MEASUREMENT
GE QC : CNR AND MTF MEASUREMENT
GE QC : CNR AND MTF MEASUREMENT
Set of acrylic (PMMA) plates allowing thickness of 25 mm, 50 mm and 60 mm.
Monthly Test
GE QC : AOP MODE AND SNR CHECK
Equipment required
GE QC : AOP MODE AND SNR CHECK
Objective
Correct choice of parameters in AOP mode
Correct level of SNR in the image
1. Put 25mm acrylic plate on the bucky.
2. Align the longest side of the plates with the chestwall edge oft the bucky.
3. Center the plate left-right.
4. Apply compression force of 5 daN.
5. Take 1 Exposure.
* Repeat these steps for the 50 and 60 mm thicknesses.
GE QC : AOP MODE AND SNR CHECK
Procedure
GE QC : AOP MODE AND SNR CHECK
25 mm. 50 mm. 60 mm.
GE QC : AOP MODE AND SNR CHECK
GE QC : AOP MODE AND SNR CHECK
25 mm.
50 mm.
GE QC : AOP MODE AND SNR CHECK
60 mm.
GE QC : AOP MODE AND SNR CHECK
GE QC : AOP MODE AND SNR CHECK
GE QC : RESULT
THANK YOU