ADC value and diffusion tensor imaging of prostate cancer: Changes in carbon-ion radiotherapy

Yukihisa Takayama, Riwa Kishimoto, Shouhei Hanaoka, Hiroi Nonaka, Susumu Kandatsu, Hiroshi Tsuji, Hirohiko Tsujii, Hiroo Ikehira, Takayuki Obata

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


Purpose: To assess the apparent diffusion coefficient (ADC) value and diffusion tensor image (DTI) including fractional anisotropy (FA) of the noncancerous prostate and prostate cancer before and after carbon-ion radiotherapy (CIRT). Materials and Methods: Nine patients with biopsy-proven prostate cancer underwent 1.5T magnetic resonance (MR) examinations. One patient with benign prostatic hypertrophy and one healthy volunteer were also examined as references. The changes in ADC values and DTI of the entire prostate calculated from b-values of 0 and 700 (s/mm2) were estimated between before and after CIRT. Results: ADC values of prostate cancer significantly increased after CIRT by paired t-test (P < 0.01) but those of noncancerous inner gland (IG) and peripheral zone (PZ) showed no significant change. By analysis of variance, significant differences in ADC values were observed among prostate cancer and noncancerous IG and PZ before CIRT (P < 0.05). After CIRT, those significant differences had disappeared. FAs showed no significant differences in any comparisons. DTI showed changes in the direction of the main axis of the tensor in prostate cancer after CIRT. Conclusion: There were changes in ADC and DTI in prostate cancer after CIRT. They may be useful for monitoring prostatic structural changes under radiotherapy.

Original languageEnglish
Pages (from-to)1331-1335
Number of pages5
JournalJournal of Magnetic Resonance Imaging
Issue number6
Publication statusPublished - Jun 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging


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