طراحی پروتکل MR انژیوگرافی اندام تحتانی با استفاده از دستگاه 1.5MRI تسلا

Background and purpose: Ôn time diagnosis and treatment of lower limb diseases are of crucial importance to the patients. Çonventional angiography is the standard procedure of diagnosis, which is followed by different problems such as, X-ray hazards, sensitivity to contrast drugs and complications of opening vessel. Doppler ultrasonography has low differentiation power. MR angiography is a suitable procedure for diagnosing vessel diseases. During different studies on 1.5 Tasla equipments it was possible to obtain proper images with different values for different parts of limb. To date no research of such kind has been done in Ïran and angiography of lower limbs is not done at present. Ïn this study, it was tried to proper images of lower limbs considering the capabilities of designed protocol system. Materials and methods: 1.5 Tasla MRÏ1 equipment with optimized parameters for different positions calculated on the volunteers, patients and phantom was used. SNR and ÇNR images were compared, and categorized by radiologist based on diagnostic values. Results: 2D-RÔF4 method using GRË-spoiled pulse sequences were selected and TR/TË/FÂ/Th parameters for pelvis area 20/6/90/5, thigh area 30/6/90/4, knee and leg 33/8/60/2/5 were obtained. First stage of recovery current, a lower, mobile pre saturated pulses, NSÂ=1, matrix size 128 to 180 at direct phase and 256 direct frequency were selected. The qualitative value of the images 3 at pelvis area 3 at femoral and knee areas and 4 for knee was obtained. Total time required for imaging of lower limb was 45 minutes. Çonclusion: Âlthoagh spoiled GRË 20-TÔF method does not produce acceptable images compared to the femora conventional angiography, the value of obtained images taken particularly for knee were significant and can be a good reference of required information for surgeons and specialists. This technique is useful particularly for the patients who can not go under conventional angiography. The value of the MR images using contrast drug is higher than the images obtained by this method, however this method is cheaper