Which method is used to evaluate image receptor-radiation field alignment?

The method used to evaluate image receptor-radiation field alignment is the eight-penny test. This technique involves placing eight pennies in a pattern beneath the radiation field to assess whether the radiation beam is correctly aligned with the image receptor. If the alignment is accurate, the outline of the pennies should be visible on the radiograph taken, confirming that the radiation field corresponds with the intended area of the image receptor.

This test is a simple and effective way to ensure that the area being imaged is accurately represented, which is critical for diagnostic quality and safety in radiographic procedures. Proper alignment helps minimize the risk of missing important anatomical information or causing unnecessary radiation exposure to adjacent areas.

The other methods mentioned, while useful in other contexts, do not specifically address the assessment of image receptor-radiation field alignment. The star resolution pattern is more commonly used to evaluate image resolution, the pinhole camera is typically employed for determining focal spot size or beam alignment rather than field alignment, and the Wisconsin test cassette is used primarily for assessing film-screen contact and alignment rather than direct measurement of radiation field alignment.