| JaLCDOI | 10.18926/AMO/63205 |
|---|---|
| FullText URL | 76_1_25.pdf |
| Author | Sugimoto, Kohei| Kuroda, Masahiro| Yoshimura, Yuuki| Hamada, Kentaro| Khasawneh, Abdullah| Barham, Majd| Tekiki, Nouha| Konishi, Kohei| Ishizaka, Hinata| Shimizu, Yudai| Nakamitsu, Yuki| Al-Hammad, Wlla E. | Kamizaki, Ryo| Kanazawa, Susumu| Asaumi, Junichi| |
| Abstract | The apparent diffusion coefficient subtraction method (ASM) was developed as a new restricted diffusionweighted imaging technique for magnetic resonance imaging (MRI). The usefulness of the ASM has been established by in vitro basic research using a bio-phantom, and clinical research on the application of the ASM for the human body is needed. Herein, we developed a short-time sequence for ASM imaging of the heads of healthy volunteers (n=2), and we investigated the similarity between the obtained ASM images and diffusion kurtosis (DK) images to determine the utility of the ASM for clinical uses. This study appears to be the first to report ASM images of the human head. We observed that the short-time sequence for the ASM imaging of the head can be scanned in approx. 3 min at 1.5T MRI. The noise reduction effect of median filter processing was confirmed on the ASM images scanned by this sequence. The obtained ASM images showed a weak correlation with the DK images, indicating that the ASM images are restricted diffusion-weighted images. The new shorttime imaging sequence could thus be used in clinical studies applying the ASM. |
| Keywords | apparent diffusion coefficient apparent diffusion coefficient subtraction method diffusion kurtosis imaging restricted diffusion short-time imaging |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2022-02 |
| Volume | volume76 |
| Issue | issue1 |
| Publisher | Okayama University Medical School |
| Start Page | 25 |
| End Page | 32 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | Copyright Ⓒ 2022 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 35236995 |
| Web of Science KeyUT | 000762812700004 |
| JaLCDOI | 10.18926/AMO/63212 |
|---|---|
| FullText URL | 76_1_57.pdf |
| Author | Iguchi, Toshihiro| Hiraki, Takao| Matsui, Yusuke| Toji, Tomohiro| Uka, Mayu| Tomita, Koji| Komaki, Toshiyuki| Umakoshi, Noriyuki| Mitsuhashi, Toshiharu| Kanazawa, Susumu| |
| Abstract | To evaluate the volume and heat-sink effects of microwave ablation (MWA) in the ablation zone of the normal swine lung. MWA at 100 W was performed for 1, 2, and 3 min in 7, 5, and 5 lung zones, respectively. We assessed the histopathology in the ablation zones and other outcome measures: namely, length of the longest long and short axes, sphericity, ellipsoid area, and ellipsoid volume. The mean long- and short-axis diameters were 22.0 and 14.1 mm in the 1-min ablation zone, 27.6 and 20.2 mm in the 2-min ablation zone; and 29.2 and 21.2 mm in the 3-min ablation zone, respectively. All measures, except sphericity, were significantly less with 1-min ablation than with either 2- or 3-min ablation. There were no significant differences between the 2- and 3-min ablation zones, but all measures except sphericity were larger with 3-min ablation. Although there were no blood vessels that resulted in a heat-sink effect within the ablation zones, the presence of bronchi nearby in 5 lung ablation zones resulted in reduced ablation size. In high-power, short-duration MWA, the lung ablation volume was affected by ablation time. Some ablations showed that a heat-sink effect by a neighboring bronchus might occur. |
| Keywords | microwave ablation lung ablation zone heat-sink effect swine |
| Amo Type | Original Article |
| Publication Title | Acta Medica Okayama |
| Published Date | 2022-02 |
| Volume | volume76 |
| Issue | issue1 |
| Publisher | Okayama University Medical School |
| Start Page | 57 |
| End Page | 62 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| Content Type | Journal Article |
| language | English |
| Copyright Holders | Copyright Ⓒ 2022 by Okayama University Medical School |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 35236999 |
| Web of Science KeyUT | 000762812700008 |
