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Hi All, I’m encountering an issue with a couple of my Siemens CT scanners—specifically the Force and Alpha models. Several of my CT number measurements using the ACR phantom are failing for air, water, and bone. Some units fail all three, while</div>
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<div dir="ltr"><div dir="ltr"><p>Hi All,</p><p>I’m encountering an issue with a couple of my Siemens CT scanners—specifically the Force and Alpha models. Several of my CT number measurements using the ACR phantom are failing for air, water, and bone. Some units fail all three, while others only one or two.</p>
<p>I tried placing a CTDI phantom adjacent to the ACR phantom, but it showed no improvement.</p>
<p>I reported the issue to Siemens. They performed a constancy test and stated that the units were functioning normally. However, my CT number results are still outside acceptable limits. In my experience, service engineers are often reluctant to perform time-consuming calibrations unless specifically requested.</p>
<p>Has anyone experienced this before? If so, do you know which specific calibration or adjustment Siemens needs to perform to correct these CT number inaccuracies?</p><p>Imendra</p></div></div>