IRMF/IPEM Diagnostic

1
IRMF/IPEM Diagnostic X-ray Intercomparison Jan
2007 -
Participants Hospital Medical Physicists/Clinical
Scientists QA Radiographers
2
Standard X-ray beams..

• IEC 61267 Medical diagnostic x-ray equipment
  radiation conditions for use in the determination
  of characteristics
• Uniform sets of radiation conditions
• RQR Radiation beam emerging from x-ray set
• RQA Radiation beam emerging from patient
• RQR-M Mammography x-ray beams

3
Compare beams?
IEC 61267 IEC 61267 IEC 61267
IEC ref kV HVL (mmAl)
RQR5 70kV 2.58
RQR8 100 3.97
RQC5 (RQA) 70 1.5mmCu
Hospital Dept Hospital Dept
kV HVL (mmAl)
70 (/- ?) 3
100 3-4
70 Add1.5mmCu
4
Equipment

• Tertiary standard (loaned by RRPPS) Keithley
  15cc 150cc ion chambers
• Likely equipment used by participants
• ion chambers
• semiconductor photo diode (Pb backing)
• in combination with kV measuring capabilities
  (multimeter)

5
Results?

• Traceability?
• Ion chamber v photodiode?
• Estimation of uncertainty?
• Effects of
• generator/waveform?
• energy response?