erasure cycle efficiency test

Question 1

what is erasure cycle efficiency

Answer 1

to check for any ghosting i.e. residual image which may remain on image receptor after readout and erasure

Question 2

frequency of erasure cycle efficiency

Answer 2

yearly

Question 3

erasure cycle efficiency setup

Answer 3

• ensure tube and table are level
• centre tube to image receptor using 100cm
• open collimation to cover entire receptor
• cover half the plate with lead gown
• exposure using 80kVp and 25mAs
  -process image
• repeat steps 1-3 with erased receptor
• exposure using 80kVp and 0.5mAs
• expose
• if any residual image is visible then ROI analysis can be used to quantify difference between ghosted and unghosted areas

Question 4

evaluating results of erasure efficiency test

Answer 4

ROI can quantify difference of ghosted and un-ghosted regions
- values can be passed onto MPE that can calculate STP (system transfer properties) values

Question 5

if it is greater by how much should the system be taken out of action

Answer 5

5%