The Diagnostic Value Of QISS In Lower Extremity Arteriosclerosis,Comparison With CT Angiography

Objective: To compared with CTA, vein between single excitation(quiescent interval single shot, QISS- MRA) sequence image quality in the lower extremity atherosclerosis, and the comparison of the accuracy of the lower extremity artery stenosis.Materials and Methods: Collected clinical suspected 36 patients with lower extremity artery stenosis disease. All patients were respectively 3.0 T vein between single excitation(quiescent interval single shot, QISS-MRA) technology and double lower limbs CT Angiography(CTA) examination. By two radiologists who has ten years experience, respectively, to analyze all images: measuring the femoral artery QISS-MRA and CTA in the best SNR(Signal to noise thewire, SNR) based on image motion artifact, brightness, artery edge is sharp, the arterial and venous branch conditions pollution situation, comprehensive QISS-MRA image quality for subjective ratings, and uses the Kappa test for grading the consistency between the statistical analysis; Respectively to evaluate MRA and CTA showed lower limb atherosclerosis stenosis degree and using the CTA results as the standard, the Kappa test is adopted toanalyze the consistency between CTA and MRA examination results. Results: 36 cases of lower limb in patients with atherosclerosis, including 22 patients with history of diabetes, 14 patients with a history of high blood pressure. All patients were successful MRA and CTA scanning. CTA signal-to-noise ratio of the average was 71.84 ± 36.71, QISS signal-to-noise ratio of the average was 274.91±142.31, respectively. In our analysis results, the popliteal artery in QISS signal-to-noise ratio is the highest(P < 0.001), the external iliac artery in QISS signal-to-noise ratio is the lowest(P < 0.001); If lower limb artery is divided into three parts(POTS, thigh and calf), the calf part of artery signal-to-noise ratio is highest, the second is the thigh and the lowest is basin of the signal-to-noise ratio of the vessel. Two doctors according to the motion artifact, the brightness of the artery, the edge is sharp, artery branches and venous pollution situation five QISS-MRA and CTA are subjective to the result of the comprehensive score(average) : 3.92±0.30, 3.94±0.26 mm, Between CTA and QISS image has a statistically significant difference between the value(P < 0.001).32 patients with a total of 539 section, using CTA test results are as follows: total level 0, 228, 1 136 cases, 2 levels of 28 cases, 3 61 cases, 85 cases of grade 4. With MRA detection results are as follows: level 0 221, grade 1 149 cases, 2 levels of 28 cases, three levels of 58 cases, 83 cases of grade 4. CTA and MRA to check the consistency of narrow as high as 94.06%(507/539), high consistency ofCTA and MRA evaluation of lower extremity artery stenosis(kappa = 0.917 ± 0.917).Conclusion: MRI an NCE-QISS technology is a kind of temporal resolution and spatial resolution are higher artery imaging technology, its graphics signal-to-noise ratio is high, the artery acute edges, without contrast, without ionizing radiation, the vascular stenosis can make an accurate diagnosis, so it can be used to replace the CTA evaluation of lower extremity atherosclerosis patients with DSA a effective therapeutic preoperative diagnostic noninvasive examination.