What causes ghost images on a photostimulable phosphor (PSP)?

• A. Incomplete exposure to radiation
• B. Incomplete erasure of the PSP
• C. Improper handling of the imaging plate
• D. Excessive exposure time

Answer: (B)

Ghost images on a photostimulable phosphor (PSP) are primarily caused by incomplete erasure of the PSP. During the imaging process, the PSP holds onto residual energy from previously captured images. If the erasure process, which is designed to clear this residual information before the plate is reused, is not done thoroughly, remnants of the prior image can influence new images, leading to the appearance of ghost artifacts.

These ghost images can mislead interpretation, as they appear as faint duplicates of previously stored data, potentially obscuring details in the current image. Proper erasure techniques and protocols are therefore critical in ensuring high-quality imaging results. The other factors listed, while they can affect image quality, do not specifically lead to the ghosting phenomenon in the same way that incomplete erasure does.