小谷 和彦¹, 山根 明文², 田丸 俊三², 上田 正伸², 宮川 征男²

Kazuhiko KODANI¹, Akihumi YAMANE², Shunzo TAMARU², Masanobu UEDA², Ikuo MIYAGAWA²

¹鳥取大学医学部放射線科, ²鳥取大学医学部泌尿器科

¹Department of Radiology, Tottori University School of Medicine, ²Department of Urology, Tottori University School of Medicine

キーワード : Prostate, Amplitude image, Mean frequency image, Texture analysis

Ultrasonic B-mode examination, though widely used, is unsuitable for quantitative evaluation because modifications are necessary during image processing. The authors constructed amplitude images (AMI) and mean frequency images (FMI) using an ultrasonic back-scattered radio-frequency signal directory and judged the image patterns quantitatively by analyzing the texture. Because the probability function of amplitude is solved mathematically, we could evaluate AMI quantitatively, unlike B-mode images. We also used FMI, which displays frequency information, to compensate for B-mode images (also AMI) constructed using only amplitude information.
Twenty-six patients who had surgery (prostatic cancer (Pc) , 5 cases; chronic prostatitis (Ptis) , 5 cases; and benign prostatic hypertrophy (Ph), 16 cases) were investigated using a waterbath.
Thirteen texture parameters were calculated and compared among the three diseases (Pc, Ptis, Ph). On AMI, there were statistically significant differences (p On FMI, a statistical difference (p