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A satisfactory radiographic image was obtained using 300 mA, 20ms at 90 kVp, 182cm SID, 20cm...

A satisfactory radiographic image was obtained using 300 mA, 20ms at 90 kVp, 182cm SID, 20cm OID, 1mm FSS, 8:1 grid, 400 IP (CR), and no pathological condition.

In order to maintain the Detective Quantum Efficiency (DQE) of the image, what would be the new exposure factor at 91 cm?

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