Abstract #3214

Is ADC Affected by Distortion of EP-DWI for Distinguishing Parotid Gland Tumor- To Compare ADC of Parotid Gland in Echo-Planar DWI and PROPELLER DWI

Kai-Min Chien¹, Yi-Jui Liu², Yi-Hsiung Lee ^3,4, Hing-Chiu Chang ⁵, Hui-Chu Chiu ⁶, Ta-Wei Chiu ⁷, Kang Hsu ⁸, Hsian-He Hsu ^4,9, Chun-Jung Juan^4,9, Yu-Shu Fu¹⁰, and CHENG-YI JUAN¹¹

¹Master 's Program of Biomedical Informatics and Biomedical Engineering, Feng Chia University, Taichung City 407, Taiwan, ²Department of Automatic Control Engineering, Feng Chia University, Taichung City 407, Taiwan, ³Ph. D. Program of Electrical and Communications Engineering, Feng Chia University, Taichung City 407, Taiwan, ⁴Department of Radiology, Tri-Service General Hospital, Taipei, Taiwan, ⁵Department of Diagnostic Radiology, The University of Hong Kong, Hong Kong, Hong Kong, ⁶Ph.D. program of Technology Management, Chung Hua University, Hsinchu, Taiwan, ⁷Department of Medicine, Taipei Medical University, Taipei, Taiwan, ⁸Department of Dentistry, National Defense Medical Center, Taipei, Taiwan, ⁹Department of Radiology, National Defense Medical Center, Taipei, Taiwan, ¹⁰Master 's Program of Biomedical Informatics and Biomedical Engineering, Feng Chia University, TAICHUNG, Taiwan, ¹¹Institute of Automatic Control Engineering, Feng Chia University, TAICHUNG, Taiwan

The study is to investigate if the perceptible geometric distortions could bias for parotid pleomorphic adenomas (PMA) by ADC measurements by comparing PROPELLER-DWI with EP-DWI. This retrospective study enrolled 14 PMAs. All participants underwent 1.5-T fat-saturated diffusion-weighted imaging with PROPELLER-DWI and EP-DWI. ADCs were measured on normal parotid gland and PMA for PROPELLER-DWI and EP-DWI. Our results showed that PMAs had significantly higher ADC than normal parotid glands no matter on PROPELLER-DWI or EP-DWI. The ADC measured by PROPELLER-DWI was significantly higher than by EP-DWI, but they were proportional to each other. EP-DWI allows distinguishing PMAs even under image distortion.

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