CAMRT RTR Exam Practice Questions - CAMRT National Certification Examination - Radiological Technology Exam

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A PA chest radiograph is performed at a 180 cm (72 inch) source-to-image distance rather than the typical 100 cm used for many other examinations. The main reason for the longer SID is to:

Increase magnification of the heart for assessment Reduce magnification so heart size is represented accurately Increase the entrance skin dose to the patient Allow a lower kVp to be used

Correct Answer:

Reduce magnification so heart size is represented accurately

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