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Method and an apparatus for calculation of the weight and detection of patient positioning for specific absorption rate (SAR) adjustment for workflow automation and bringing additional safety at clinical scanners Disclosure Number: IPCOM000028961D
Original Publication Date: 2004-Jul-25
Included in the Prior Art Database: 2004-Jul-25

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In the present clinical MR (Magnetic Resonance Imaging) or CT (Computer Tomography) scanners, the operator manually makes an entry for the patient's weight, age, positioning head first/feet first, prone/supine (see fig. 1). The software compares the weight entered by the operator with the standard values for weight (e.g. a 25 year old man can not weigh 10 kg, the approximate weight range would be 50-100 kg etc.). For high field system, for various sequences specific absorption rate (SAR) adjustments are essential. SAR is position dependent and varies with the patient positioning. E.g. if the patient changes his position by putting hands on the chest/stomach. During quality assurance check, the system asks for phantom/load. In case, the operator forgets to put phantom/load, wrong adjustments could be made. Also high potentials could lead to arcing. The operator must ensure that the arms and the legs are not touching. He advices the patient to keep a distance of at least 5 cm as skin contacts may cause large-surface current loops. However the operator does not view the patient's complete body movement during the scan.