Usefulness of Lower Extremity 2D TOF MR Venography with Respiratory Compen- sation Technique, and Effect of Patient Positioning on the Visualization of Deep Veins in the Leg

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  • 呼吸補正法を併用した2D-TOF下肢MR Venographyの有用性と,撮像体位の違いによる下腿部深部静脈描出能の検討

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We evaluated the usefulness of two-dimensional time-of-flight(2D TOF) MR venography (MRV) of the lower extremity using the respiratory compensation (RC) technique. In addition, six variations in patient positioning of the leg and knee were investigated to determine the best method of visualizing the dee popliteal veins and lower leg. All data sets were reviewed and graded for visualization of the deep veins at the pelvis, thigh, and leg portion (4-point scale)by two radiologists and three radiological technologists. The same veins demonstrated with various positions of the patient were also evaluated in the same manner. In conclusion, 2D TOF MRV with RC resulted in increased uniformity of vein signal in the pelvic area. Furthermore, we should position the patient's leg so as not to compress the vein at the posterior portion of the leg, and not to over-extend the knee joint. This enabled the best results to be obtained in MRV of the lower extremity.

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