A portable chest radiograph is obtained on a recumbent patient using 86kVp and 1.6 mAs, @ 44” SID. You are asked to repeat the exposure with the patient in an erect position. If you are able to obtain an SID of 68”, what new technique would be required?

A portable chest radiograph is obtained on a recumbent patient using 86kVp and 1.6 mAs, @ 44” SID. You are asked to repeat the exposure with the patient in an erect position. If you are able to obtain an SID of 68”, what new technique would be required?

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Question

4. An acceptable image was created using 75kVP 22mAs at 40”SID on a patient with a broken hip. A traction device was installed on the bed and a follow up image was ordered. The Traction bar required made it impossible to obtain a 40”SID. A 60” SID must be used, what mAs should be used to compensate for the SID change?

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