Separate geometric X-ray magnification from display zoom. Geometric magnification is source-to-detector distance divided by source-to-object distance. Object-plane pixel sampling alone is not defect resolution, and screen enlargement cannot recover missing acquisition information.
Measure distances from the same source
Matsusada defines the ratio using focal-point-to-detector and focal-point-to-object distances. Hypothetical distances of 400 mm and 100 mm give M=4. The 300 mm object-to-detector gap is not the numerator.
Sampling is not defect resolution
With a hypothetical 100 micrometer detector pixel pitch and M=4, ideal object sampling is 25 micrometers. Focal spot, detector response, motion, contrast and processing also affect visible detail. This does not guarantee detection of every 25 micrometer void.
Account for focal-spot blur
XIMEA gives detector-plane geometric unsharpness as focal-spot size times (M minus 1). For an assumed 5 micrometer spot and M=4, that contribution is 15 micrometers at the detector, not total object resolution.
Retain target location and original images
Different target heights can have different source distances. Retain the target layer, distances, pixel pitch, tube conditions and acquisition settings. State whether the image supports location, comparison or quantification. Document crop, interpolation and sharpening.
Review records
| Item | Unit or condition | Retain |
|---|---|---|
| Geometric M | Dimensionless | Source-detector/source-object |
| Object sampling | Micrometers | Detector pitch/M |
| Geometric blur | Micrometers | Name the reference plane |
| Display zoom | Percent or ratio | Display processing |
Products and related methods
surface mount PCB jumpers · Surface Mount PCB Jumper Microsections: Define the Cut Plane
Question
Does a larger screen improve acquired resolution? It can improve viewing but does not change acquisition geometry or sampling.
Sources
Matsusada geometric magnification；XIMEA source geometry and focal spot
The cover is an AI concept. Projection lines and shadows are not an exact ray diagram, real radiograph, equipment setup or defect evidence. No Hongchuan performance, equipment capability or test result is claimed.