Magma (New York, N.Y.)
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Magma (New York, N.Y.) · Dec 2015
Experience with magnetic resonance imaging of human subjects with passive implants and tattoos at 7 T: a retrospective study.
Over the last decade, the number of clinical MRI studies at 7 T has increased dramatically. Since only limited information about the safety of implants/tattoos is available at 7 T, many centers either conservatively exclude all subjects with implants/tattoos or have started to perform dedicated tests for selected implants. This work presents our experience in imaging volunteers with implants/tattoos at 7 T over the last seven and a half years. ⋯ Our initial experience at 7 T indicates that a strict rejection of subjects with tattoos and/or implants is not justified. Imaging can be conditionally performed in carefully selected subjects after collection of substantial safety information and evaluation of the detailed exposure scenario (RF coil/type and position of implant). Among the assessed subjects with tattoos, no side effects from the exposure to 7 T MRI were reported.
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Magma (New York, N.Y.) · Dec 2015
The repeatability of T2 relaxation time measurement of human knee articular cartilage.
To assess short- and long-term repeatability of T2 relaxation time measurements of the knee articular cartilage. ⋯ The current results show mostly good repeatability. However, there were remarkable variations of T2 between bulk cartilage and different ROIs, bulk cartilage showing better repeatability. With careful patient positioning T2 can be accurately determined for different cartilage surfaces.