2.2 | Inspection method
In this study, SE (539 / 12ms) and FSE (4020 / 90ms) [4] were used to obtain T1 or T2 weighted and MR enhanced images. Based on the enhanced MRI images, the 3.0T1H-MRS measurement area was located, and the region of interest was selected for the enhanced nodule and the ipsilateral normal frontal brain tissue, the size of which was 2.0 × 2.0 × 2.0 cm3. Contrast medium: 15 ml, 0.1 mmol / kg Gd-DTPA, high pressure syringe, injection speed of 3 ml / s were used. 3.0T1H-MRS was detected by single voxel hydrogen proton spectrum detection technology. The fixed-point resolution spectrum sequence was used to compare the nasal mucosa polyp area and the normal brain tissue in the forehead. The shimming, water suppression and signal acquisition were automatically completed; the phase correction, baseline correction and measurement were used as the post-processing part, and the real part of the spectrum was taken for analysis. This paper mainly studies the integral values of the wave peaks of acetic acid (Ace), lactic acid (Lac), n-acetylaspartic acid (NAA), choline (Cho), creatine (Cr), and the ratio of the integral values: Cho / NAA, Cr / Lac, Cr / NAA, Cho / Cr, Lac / NAA and Lac / Ace.