h. Count the full boxes of film used during the study.
i. Collect all the rejected radiographs after 1,000 films have been processed.
j. Record the reject numbers on a tally sheet.
k. Analyze the rejected films as either too light or too dark and list the possible
causes: machine, processor, or technician.
l. Determine the repetition rate of total repeated films and total films used. For
1225 films processed.
153 films repeated.
153 divided by 1,225 equals 12 percent repeated.
Repeat rate is different from rejection rate.
m. Determine the rejection rate of total rejected films, total films used, and total
films wasted (green and clear). For example:
1,225 films processed plus 250 films wasted equals 1,475 films used.
l53 films rejected.
153 divided by 1,475 equals 10 percent rejected.
n. Determine the percent of rejection according to categories. For example, if
153 films were rejected and 49 of them were too dark, the dark film repeat rate is 32
percent (49 divided by 153). The categories for rejection are listed below:
Films too dark.
Films too light.
Positioning of the same body parts reoccurs (skull, abdomen, etc.).