Abstract

The imaging quality and clinical application of high field magnetic resonance conventional pulse sequence imaging T1WI, T2WI, and DWI in lung cancer examination were explored, and the advantages and disadvantages of each sequence imaging were evaluated. A total of 38 patients with lung cancer confirmed by bronchoscopy and pathological biopsy treated in the hospital from September 2018 to March 2019 were included as research objects. All patients underwent chest MRI scans. The MRI scans were performed by using a Philips Achieva 3.0T nuclear magnetic resonance scanner, and the scanning sequences were conventional T1WI, T2WI, and DWI scans, including the horizontal axis T1WI-VIBE, T2WI-TSE, and DWI-EPI, the coronal T2WI-HASTE, and the axial T2WI-HASTE; the dispersion sensitive factor b value of DWI axial scans were respectively 200 s/mm2, 400 s/mm2, and 800 s/mm2. The overall image quality under each sequence, the image developments of lesions, the chest wall invasions, the motion artifacts, and the presence or absence of the pericardial large vessels were invaded were compared, and the differentiating abilities of different sequences on motion artifacts, image developments of bronchial tubes, and the differentiation of lesions accompanied by obstructive pneumonia were observed and compared. The motion artifacts of the lesions under the 4 sets of sequences were obviously different, which was statistically significant (χ2=22.953, P=0.000); of all the sequences, the image artifacts under the T2WI-HASTE sequence were the least, in which the artifacts 37 cases were evaluated as grade I; under the T2WI-TSE sequence, the image artifacts of 15 cases were evaluated as grade II; under the DWI-EPI sequence, the image artifacts of 3 cases were evaluated as grade II; under the T1WI-VIBE sequence, 1 case had severe artifacts that affected the observation and diagnosis of lesion. Secondly, under the T2WI-TSE sequence, all cases were evaluated as grade I; under the T2WI-HASTE sequence, the lobar bronchi and partial bronchial tubes were seen in 36 cases, and part of the tube walls were blurred; under the T1WI-VIBE and DWI-EPI sequences, the image developments of bronchial tubes were in poor qualities, or even not developed at all. Thirdly, under the T2DWI-TSE, T2DWI-HASTE, and DWI-EPI sequences, lung cancer, and atelectasis could be distinguished; however, under the T1DWI-VIBE sequence, lung cancer and atelectasis failed to be distinguished. Conclusion: In the 3.0T magnetic resonance conventional pulse sequence imaging, each sequence has certain advantages and disadvantages; in addition, the lung cancer and atelectasis can be effectively distinguished by imaging under the T2DWI-TSE, T2DWI-HASTE, and DWI-EPI sequences.