​Siemens—Symbia T and Symbia Intevo Systems Using CARE Dose4D Algorithms: Unnecessary Radiation Exposure May Occur

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​In a Customer Safety Advisory Notice letter submitted by an ECRI Institute member hospital, Siemens states that incorrect tube-current calculations by the CARE Dose4D algorithm when using posterior-anterior (PA) or anterior-posterior (AP) topograms to scan the head regions with the above systems may lead to an unnecessary increase in radiation exposure. Siemens also states that in rare cases, the above systems may exhibit an inappropriately calculated dose distribution, depending on the skull's geometric shape. Siemens further states that the CARE Dose4D algorithm may select the maximum tube current for the uppermost part of the skull, potentially leading to unnecessary radiation exposure. The problem does not occur when a lateral topogram is used. The manufacturer has not confirmed the...