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QC

Red Boxes

TermDefinition
Ion Chamber 100-300V Least sensitive
Proportional counter 300-900V
Geiger Muller 900-1200V Most sensitive
1R 2.58e4 C/kg 1000mR
kVp accuracy HARP : +/- 8% Semi-annual SC35: +/- 10% Annual (Average kVp - set kVp)/set kVp
HVL HARP: 2.5 mmAl SC35: 1.5 mmAl
Reproducibility of Exposure HARP: CV<0.08, Exposure within 20% from mean - Semi-annual SC35: CV<0.05, Exposure within 15% from mean - Annual 1. Find Average 2. Find SD 3. Find CV 4. Variation from mean: (x-X)/X*100
Linearity HARP (Semi-Annual) |x1-x| < 0.10(x1+x2) SC35 (Annual)
Time HARP : 1/30 s or 5mAs - Semi-annual
AEC variation Variation = (max EXI - min EXI)/min EXI kVp --> SC35 --> 0.15 variation OD part thickness --> SC35 --> 0.20 variation OD
AEC testing back-up timer HARP: at 50 kVp <2000mAs - Semi-annual SC35: N/S: Annual
AEC min exposure time HARP: 1/60 s or 5mAs - Semi-annual SC35: N/S: Annual
AEC consistency with varying mA HARP: N/S - Semi-annual SC35: N/S: Annual
AEC consistency with varying kVp HARP: N/S - Semi-annual SC35: 0.15 variation in OD - Annual
AEC consistency with varying part thickness HARP: N/S - Semi-annual SC35: 0.20 variation in OD - Annual
AEC consistency with varying field sizes HARP: N/S - Semi-annual SC35: N/S: Annual
AEC consistency of detectors HARP: (max mR - min mR)/min mR <0.20- Semi-annual SC35: N/S: Annual
AEC reproducibility HARP: N/S - Semi-annual SC35: 0.10 variation in OD - Annual
AEC Density control HARP: N/S - Semi-annual SC35: N/S: Annual
Collimation Stepless Min field size > 5cm x 5cm @ 100 cm SID
Collimation - HARP Misalignment of Length and width +/2% of SID Size of x-ray field within 3% of SID
Collimation SC35 Misalignment of Length and width +/2% of SID PBL: Size of x-ray field within 3% of SID PBL: total misalignment should not exceed 4% of SID
Light-field /Radiation Field Alignment HARP +/- 2% of SID - S-A SC35 +/- 2% of SID - A
IR/Radiation Field Alignment HARP +/- 3% of SID - S-A SC35 +/- 3% of SID - A
Beam perpendicularity HARP Alignment +/- 2% of SID - S-A SC35 Alignment +/- 2% of SID - A
Focal Spot size HARP: N/S - Semi-annual SC35: N/S: Annual
Created by: user-1987883
 

 



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