During QC testing of a CR system, a receptor demonstrates weaker radiation response on one side. This issue is related to which?

During QC testing of a CR system, a receptor demonstrates weaker radiation response on one side. This issue is related to which?

• A. Erasure thoroughness
• B. CR reader calibration
• C. Image receptor calibration
• D. Plate uniformity

Answer: (D)

Plate uniformity is being tested. If a receptor shows weaker radiation response on one side, it means the plate’s sensitivity isn’t uniform across its surface. A uniform exposure should produce about the same signal everywhere; a dimmer edge or region points to variations in the phosphor layer, binder distribution, or plate-to-reader interface in that area. This is exactly what plate uniformity QC checks for by exposing the plate with a uniform field and inspecting the response across the plate. Erasure thoroughness relates to how completely a plate is cleared before reuse, which would affect residual images rather than a localized drop in response. CR reader calibration affects how the scanner reads and converts the stored signal, usually producing global rather than edge-specific changes. Image receptor calibration adjusts the overall dose–response of the receptor, not a specific area. So the localized weaker response best indicates plate uniformity issues.

Plate uniformity is being tested. If a receptor shows weaker radiation response on one side, it means the plate’s sensitivity isn’t uniform across its surface. A uniform exposure should produce about the same signal everywhere; a dimmer edge or region points to variations in the phosphor layer, binder distribution, or plate-to-reader interface in that area. This is exactly what plate uniformity QC checks for by exposing the plate with a uniform field and inspecting the response across the plate.

Erasure thoroughness relates to how completely a plate is cleared before reuse, which would affect residual images rather than a localized drop in response. CR reader calibration affects how the scanner reads and converts the stored signal, usually producing global rather than edge-specific changes. Image receptor calibration adjusts the overall dose–response of the receptor, not a specific area. So the localized weaker response best indicates plate uniformity issues.