A cold spot compensation technique using a combination of trans-rectal ultrasonography and intraoperative computed tomography for interstitial permanent prostate brachytherapy: a single-arm prospective trial - Ishiyama, Hiromichi; Tsumura, Hideyasu; Kawakami, Shogo; Satoh, Takefumi; Sekiguchi, Akane; Tabata, Ken-ichi; Iwamura, Masatsugu; Hayakawa, Kazushige (Journal of Contemporary Brachytherapy, 2018)