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16. FDG uptake in the cervical muscles after neck dissection: imaging features and postoperative natural course on 18F‑FDG‑PET/CT.

Author

Iritani, Yukako, Kato, Hiroki, Kaneko, Yo, Ishihara, Takuma, Ando, Tomohiro, Kawaguchi, Masaya, Shibata, Hirofumi, Ogawa, Takenori, Noda, Yoshifumi, Hyodo, Fuminori, and Matsuo, Masayuki

Abstract

Purpose: This study aimed to assess the imaging features and postoperative natural course of 18F-fluorodeoxyglucose (FDG) uptake in the cervical muscles after neck dissection. Materials and methods: This study included 83 patients who underwent preoperative and postoperative 18F-FDG-PET/CT and were diagnosed with head and neck malignancy after neck dissection. Postoperative 18F-FDG-PET/CT was performed within 5 years after neck dissection. Preoperative and postoperative FDG uptake of the trapezius, sternocleidomastoid, scalene, pectoralis major, and deltoid muscles was visually assessed. Increased postoperative uptake was visually defined as higher postoperative FDG uptake than the preoperative one in the corresponding muscle. The maximum standardized uptake value (SUVmax) was measured in cases with increased postoperative uptakes. Results: Increased postoperative uptakes were observed in 43 patients (52%). The trapezius (31/83, 37%), sternocleidomastoid (19/83, 23%), and scalene (12/83, 14%) muscles were involved, as opposed to the pectoralis major and deltoid muscles were not. Increased postoperative uptakes were observed on the dissected side in all 43 patients. Significant differences between SUVmax estimated from the mixed-effects model and postoperative months were observed in the trapezius muscle (Coefficient (β) = −0.038; 95% confidence interval (CI): [−0.047, −0.028]; p < 0.001) and sternocleidomastoid muscle (β = −0.015; 95% CI: [−0.029, −0.001]; p = 0.046). Conclusions: Increased postoperative uptakes in the cervical muscles were observed on the dissected side in approximately half of the patients after neck dissection. The SUVmax in the trapezius and sternocleidomastoid muscles decreased after surgery over time. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Assessment of Arterial Involvement in Pancreatic Cancer: Utility of Reconstructed CT Images Perpendicular to Artery.

Author

Noda, Yoshifumi, Kobayashi, Kazuhiro, Kawaguchi, Masaya, Ando, Tomohiro, Takai, Yukiko, Suto, Taketo, Iritani, Yukako, Ishihara, Takuma, Fukada, Masahiro, Murase, Katsutoshi, Kawai, Nobuyuki, Kaga, Tetsuro, Miyoshi, Toshiharu, Hyodo, Fuminori, Kato, Hiroki, Miyazaki, Tatsuhiko, Matsuhashi, Nobuhisa, Yoshida, Kazuhiro, and Matsuo, Masayuki

Subjects
ARTERIOGRAPHY, DIAGNOSTIC imaging, COMPUTED tomography, RETROSPECTIVE studies, DESCRIPTIVE statistics, PANCREATIC tumors, COMPUTER-aided diagnosis, MEDICAL records, ACQUISITION of data, PANCREATECTOMY, DIGITAL image processing, CONFIDENCE intervals, CONTRAST media, SPLENIC artery
Abstract

Simple Summary: The diagnostic performance and interobserver variability of the contrast-enhanced CT currently used for evaluating arterial involvement from pancreatic cancer has limitations. The purpose of this study was to investigate the utility of reconstructed CT images perpendicular to the artery for assessing arterial involvement from pancreatic cancer and to compare the interobserver variability between it and the current diagnostic imaging method. We found that reconstructed CT images perpendicular to the splenic artery were feasible and showed less interobserver variability than current diagnostic method images. The purpose of this study was to investigate the utility of reconstructed CT images perpendicular to the artery for assessing arterial involvement from pancreatic cancer and compare the interobserver variability between it and the current diagnostic imaging method. This retrospective study included patients with pancreatic cancer in the pancreatic body or tail who underwent preoperative pancreatic protocol CT and distal pancreatectomy. Five radiologists used axial and coronal CT images (current method) and perpendicular reconstructed CT images (proposed method) to determine if the degree of solid soft-tissue contact with the splenic artery was ≤180° or >180°. The generalized estimating equations were used to compare the diagnostic performance of solid soft-tissue contact >180° between the current and proposed methods. Fleiss' ĸ statistics were used to assess interobserver variability. The sensitivity and negative predictive value for diagnosing solid soft-tissue contact >180° were higher (p < 0.001 for each) and the specificity (p = 0.003) and positive predictive value (p = 0.003) were lower in the proposed method than the current method. Interobserver variability was improved in the proposed method compared with the current method (ĸ = 0.87 vs. 0.67). Reconstructed CT images perpendicular to the artery showed higher sensitivity and negative predictive value for diagnosing solid soft-tissue contact >180° than the current method and demonstrated improved interobserver variability. [ABSTRACT FROM AUTHOR]

Published
2024
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18. 7‐1: Developing new Ferroelectric Liquid Crystal for LCOS.

Author

Ando, Tomohiro, Kanamori, Yuta, Nakamura, Manabu, Livingston, Michelle, Gabriel, Christopher, and Scott Hathcock, R.

Subjects
FERROELECTRIC liquid crystals, VIRTUAL reality, PIXELS
Abstract

Ferroelectric liquid crystals (FLCs) have two attractive characteristics: very fast switching speeds and stable alignment against electrical fringe fields from neighboring pixels. However, care needs to be taken because FLC panels can be prone to alignment defects caused by Chevron structures. At this time, we have succeeded in developing a new FLC which has an improved temperature range, with a wider SmC phase, and which is more stable, thus making it less likely to have alignment defects. We look forward to demonstrating this to you with LCOS panels containing this new FLC. [ABSTRACT FROM AUTHOR]

Published
2024
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