Visualization of Ovarian Tumors using 3T MR Imaging : Diagnostic Effectiveness and Difficulties

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概要

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• Purpose: We evaluated the diagnostic effectiveness of magnetic resonance (MR) imaging at 3 tesla to visualize ovarian tumors and problems associated with its use. Materials and Methods: From the records of 423 consecutive women who underwent pelvic MR imaging using a 3T system from April 2009 to June 2010, we analyzed 50 continuous cases of ovarian tumors proved by histopathology. We evaluated visualization of these tumors for image quality and artifacts using 5-point scales. For qualitative assessment, we scored overall image quality (1, poor, to 5, excellent), degree of conviction regarding the diagnosis (1, undiagnosable, to 5, diagnosable with high certainty), and 4 representative artifacts (penetrating, chemical shift, motion, and susceptibility artifact) (1, severe, to 5, little degradation). We also retrospectively reviewed the diagnostic features of the ovarian tumors and preoperative diagnostic accuracy. For quantitative assessment, we determined tumor size and ADC value. Results: Overall quality score was scored 4.9±0.5, and conviction regarding diagnosis was 4.9±0.3. Artifacts caused little degradation in most cases: penetrating, 4.8±0.5; chemical shift, 4.3±0.5; motion, 4.6±0.6; and susceptibility, 3.8±0.9. Preoperative diagnostic accuracy was 92% (sensitivity 94.7%, specificity 90.3%). Mean tumor diameter was 88.3±61 mm. The mean ADC value was 1.04±0.3 in malignant tumors and 1.15±0.5 (×10−6 mm2/s) in benign tumors. Conclusion: The quality of ovarian tumor images obtained with a 3T MR imaging system is adequate for diagnosis, with only slight degradation from penetrating or susceptibility artifacts.

• 2012-09-01

著者

• Nakagawa Hiroyuki

  Department Of Applied Chemistry School Of Science And Engineering Waseda University

• Kitano Satoru

  Department Of Radiology Nara Medical University

• Takahama Junko

  Department Of Radiology Higashi Osaka City General Hospital

• Takahashi Aki

  Department Of Chemistry Nara Women's University

• Kichikawa Kimihiko

  Department Of Radilogy Nara Medical University

• Itoh Takahiro

  Department Of Breast And Endocrine Surgery Nagoya University School Of Medicine

• Uehara Tomoko

  Department Of Biochemical Engineering And Science Kyushu Institute Of Technology

• Marugami Nagaaki

  Department Of Central Endoscopy And Ultrasound Nara Medical University

• TAKAHASHI Aki

  Department of Radiology, Nara Medical University

• TAKEWA Megumi

  Department of Radiology, Nara Medical University

• TAKAHAMA Junko

  Department of Radiology, Nara Medical University

• UEHARA Tomoko

  Department of Radiology, Nara Prefectural Nara Hospital

• ITOH Takahiro

  Department of Radiology, Nara Medical University

• NAKAGAWA Hiroyuki

  Department of Radiology, Nara Prefectural Nara Hospital

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