Abstract
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 Iran and angiography of lower limbs is not done at present. In this study, it was tried to proper images of lower limbs considering the capabilities of designed protocol system.1.5 Tasla MRI equipment with optimized parameters for different positions calculated on the volunteers, patients and phantom was used. SNR and CNR images were compared, and categorized by radiologist based on diagnostic values. First stage of recovery current, a lower, mobile pre saturated pulses, NSA=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. This techniques 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.
Highlights
Atherosclerosis is a main problem in elderly men worldwide
Phantom current was designed and produced for arrangement of the parameters. This phantom was cubical form storage with diameters 30×15×15 centimeters as 2 mm diameter plastic tube was installed from both sides, in such a way that, pumping of current in plastic tube causes current in both sides of the storage in opposite direction. In this way the of opposite direction of current in lower extremity loud vessel is Assimilated 200-400 ml per minute water passes form the tube through pumping per minute.Time of flight method angiography and pulse frequency 2Dspoiled GRE toward axial was considered for angiography of lower extremity and different parameters considering the speed limit and blood flow, time of proper imaging, proper rate of differentiating power, SNR1 and CNR2 were calculated and tested
The obtained best flip angle (FA) using Ernest angle formula at the slice every repetition (TR) of 20- 40 ms is about 10 degree .Based on the figure 1, at this range, of TR, rate of FA for muscle (T1=900 ms) was about 15 degree and for fat T1=300 ms about 20 degree
Summary
Atherosclerosis is a main problem in elderly men worldwide. Most of the study is in this regard is done on coronary artery and less Athens ion has been paid to the lower extremity (l). Concomitant Presence of this disease in periphery organs and cardiac vessels increases the incidence of death. In 25% of the patients having problem with the lower extremity there is significant, progress on pass of time, which leads to lack of motility gang rent, and organ for cut [1]. Degree lower extremities problems indicating the rate of atherosclerosis in whole body organ which show's that the patient is at a high risk condition. Quick and cheap procedure in diagnosis of this disease always has been in the mind [1]. Of the researchers of the non-invasive procedure excluding MRA1, there are other procedures like B-mode sonography and color Doppler which hare certain limitation at the back bone and gas and in the fat patients need an export and skillful personal
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