A radiograph of a lateral thoracic spine reveals that there is excessive density along the posterior aspect of the spine.Even with good collimation, the scatter radiation reaching the image receptor obscures the spinous processes.What can the technologist do to improve the visibility of the posterior elements of the spine?

Question

Quizplus · Accepted Answer

By placing a lead mat on the tabletop just posterior to the patient, the scatter radiation can be reduced and the visibility of the posterior elements of the spine can be improved. This technique, known as a "backscatter shield," is particularly useful when there is excessive density along the posterior aspect of the spine. Using higher-speed screens and film or a higher-ratio grid may reduce scatter radiation to some extent, but they do not address the specific issue of excessive density along the posterior aspect of the spine. Increasing the kV and lowering the mAs may further increase scatter radiation and worsen the problem.

A Radiograph of a Lateral Thoracic Spine Reveals That There