For XtremeCTI: A 2.7-cm-long volume of interest is scanned with a spatial resolution of 82 µm3, or an X-ray tube voltage of 59.4 kVp, a current of 900 µA, and an integration time of 100 ms. The minimal length of the scout view should include imaging of the 2nd and 3rd MCP joint spaces, with at least 3 mm on either side of the joint space to ensure adequate assessment of joint positioning. The landmark is located at the top of the 3rd metacarpal head (Figure 1) The effective dose is <9 µSv.

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For XtremeCTII: A 3-cm-long volume of interest (VOI) is scanned with a spatial resolution of 60.7 µm3, or an X-ray tube voltage of 68.0 kVp, a current of 1470 µA, and an integration time of 43 ms. The minimal length of the scout view should include imaging of the 2nd and 3rd MCP joint spaces, with at least 3 mm on either side of the joint space to ensure adequate assessment of joint positioning. The landmark is located at the top of the 3rd metacarpal head. The effective dose is <9 µSv.