Publications by authors named "Tomomi Kawahara"
Article Synopsis
- * Methods: An analysis of 395 transvaginal scans conducted over a year revealed 9 cases of abnormal intra-amniotic structures, compared against 87 cases of low-lying placentas and 299 controls with normal outcomes.
- * Results: The incidence of abnormal intra-amniotic structures was 2.28%. These cases were associated with higher rates of complications during delivery, emphasizing the importance of mid-second-trimester screening to improve perinatal health.
Article Synopsis
- The study aimed to evaluate the embryonic genital tubercle using transvaginal 3D ultrasound in the early weeks of gestation (8-10+6 weeks).
- Researchers conducted 102 ultrasound scans and measured the genital tubercle angle (GTA) and length (GTL), assessing the agreement between different observers.
- The findings showed no significant differences in GTA or GTL between male and female embryos during this period, but GTL increased steadily with gestation, indicating its growth in early pregnancy.
Article Synopsis
- The study aimed to illustrate shunt flow in small ventricular septal defects (VSDs) using advanced imaging techniques like HDlive Flow and STIC.
- Four cases of small isolated VSDs were analyzed using color Doppler and the mentioned imaging methods.
- The findings suggest that HDlive Flow with STIC and HDlive Silhouette offers better visualization of shunt flow compared to traditional color Doppler methods, enhancing real-time spatial recognition.
Article Synopsis
- This study examined the use of transvaginal color Doppler and HDlive imaging to assess umbilical cord cysts (UCCs) in early pregnancy, specifically before 11 weeks of gestation.
- Out of 135 scans performed, 17 UCCs were identified, with their characteristics, locations, and blood flow analyzed.
- The findings suggest that UCCs are relatively common, usually resolve on their own by 15 weeks, and are associated with positive neonatal outcomes, indicating they are typically benign.
Objectives: To describe embryonic and fetal tiny pericardial fluid collections (PFCs) using transvaginal sonography and HDlive Silhouette at less than 12 weeks of gestation.
Methods: During an 8-month period from November 2021 to June 2022, one-hundred and thirty transvaginal scans were performed for first-trimester dating, and eleven tiny PFCs of the embryo or fetus were identified at 8+4 - 11+3 weeks of gestation (three at 8, six at 9, and two at 11 weeks). HDlive Silhouette features of PFC were evaluated.
Objectives: To describe prevalence, outcome, color Doppler, and HDlive Flow (Silhouette) with spatiotemporal image correlation (STIC) features of isolated tortuous ductus arteriosus in Japanese fetuses at 28-31 + 6 weeks of gestation.
Methods: During a 37-month period, 3,150 fetal screenings were performed at 28-31 + 6 weeks of gestation. Isolated tortuous ductus arteriosus was evaluated using color Doppler and HDlive Flow (Silhouette) with STIC.
Objectives: To assess fetal cardiac structures using HDlive Flow Silhouette with spatiotemporal image correlation (STIC) at 12 to 14 + 6 weeks of gestation, and verify the feasibility of obtaining five cardiac views in the late first and early second trimesters of pregnancy. The fetal cardiac shape and the aspect of the descending aorta were also evaluated.
Methods: Eighty normal fetuses at 12 to 14 + 6 weeks of gestation were studied using trans-abdominal HDlive Flow Silhouette with STIC to assess the feasibility of five fetal cardiac views (frontal, spatial three-vessel, panoramic, posterior, and right lateral views).
Stereotactic radiosurgery (SRS) and radiotherapy (SRT) are intricate techniques that deliver a highly precise radiation dose to a localized target, usually a tumor. At our hospital, we perform SRS and SRT on brain tumors using a linear accelerator (linac) mounted with an external micro multi-leaf system. The Task Group TG-142 Report by the American Association of Physicists in Medicine recommends the coincidence of the radiation and mechanical isocenter to be within ±1 mm.
View Article and Find Full Text PDFDigital pelvic radiographs are used to identify the locations of implanted iodine-125 seeds and their numbers after insertion. However, it is difficult and laborious to visually identify and count all implanted seeds on the pelvic radiographs within a short time. Therefore, our purpose in this research was to develop an automated method for estimation of the number of implanted seeds based on two-view analysis of pelvic radiographs.
View Article and Find Full Text PDF