Signa hde 1.5 t

The Signa HDe 1.5 T superconducting MRI imager provided by GE was used to scan the neck cross section, coronal plane, and sagittal plane using conventional spin echo (SE). T1WI and T2WI modes and using NMR diffusion weighting imaging (DWI) to measure the apparent diffusion coefficient (ADC). More than 2 radiologists read the image, and the short axis diameter of the lymph node tissue, signal intensity (uniform/uneven), margin (regular/irregular), boundaries (clear/unclear), T1WI signal intensity (high intensity/equal intensity, low intensity), T2WI signal intensity (high intensity/equal intensity, low intensity), ADC value were recorded.

Magnetic resonance imaging scanners named Signa Hde 1.5 T and Discovery MR750 (3 T) from General Electric Company (GE) were used. After lunching the exam to be ready for the diagnosis, the spinal phasing front coil is used, and the patient wearing hearing protection is instructed not to move during the examination. The lumbar scan protocol was used during scanning. The scanning sequence and azimuth included the FSE-T₁WI sequence in the sagittal plane, the FSE-T₂WI sequence in the sagittal plane, the FSE-T₂WI sequence in the sagittal plane, and the FSE-T₂WI sequence in the transverse plane. Due to the possibility of disc-bone overlap in cross-sectional T₂WI sequences, which affects image representativeness, only sagittal T₂WI sequences were used in this study. The main parameters included TR 2000 ms, TE 120 ms, layer thickness 4 mm, layer spacing 0.5 mm, matrix 320*224, average acquisition times twice, and field of view 320 mm*320 mm.