In order to achieve a true SID of 40" with an x-ray tube angle of 30degrees, the overhead scale should read A)23 inches. B)95 cm. C)34.6 inches. D)both b and c

Question

Quizplus · Accepted Answer

When the x-ray tube is angled, the source-to-image distance (SID) must be adjusted to maintain the true SID. Using trigonometry, the true SID is calculated as the cosine of the angle times the desired SID. For a 30-degree angle, the cosine is approximately 0.866, so 40" * 0.866 = 34.6 inches.

In Order to Achieve a True SID of 40" with an X-Ray