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Compressed Sensing vs. Conventional Parallel Imaging: Utility of Head and Neck MRI for Image Quality and Inspection Efficacy

Hirotaka Ikeda¹, Yoshiharu Ohno¹, Kaori Yamamoto², Kazuhiro Murayama³, Masato Ikedo², Masao Yui², Satomu Hanamatsu¹, Akiyoshi Iwase⁴, Takashi Fukuba⁴, and Hiroshi Toyama¹
¹Radiology, Fujita Health University School of Medicine, Toyoake, Japan, ²Canon Medical System Corporation, Otawara, Japan, ³Joint Research Laboratory of Advanced Medical Imaging, Fujita Health University School of Medicine, Toyoake, Japan, ⁴Fujita Health University Hospital, Toyoake, Japan

CS with PI has better capability than conventional PI for improving head and neck MR imaging with a shorter examination time and quantitatively better image quality and without any significant deterioration of qualitative image quality.

Figure1. 21-year-old male with lymphatic malformation (L to R: cranial to caudal level).

T2-weighted images obtained with CS with PI and with conventional PI clearly demonstrate the multiple cystic lesions extending from parotid space to parapharyngeal space (arrows). Neither image showed significant artifacts and both had the same overall image quality. The examination time of CS with PI (76 sec) was much shorter than that of conventional PI (126 sec).

Figure 2. Results of comparison for each quantitative image quality index among CS with PI and conventional PI.

SNR of CS with PI (11.2±3.6, mean ± standard deviation) was significantly higher than that of conventional PI (8.9±2.6, p<0.0001). %CV of CS with PI (9.6±3.0) was significantly lower than that of conventional PI (11.9±3.5, p<0.0001). CNR of CS with PI (7.7±2.9) was significantly higher than that of conventional PI (6.1±2.2, p<0.0001).