Publications by authors named "Yoshitaka Noguchi"

Objective: To report our experience on a rare case of a ruptured aneurysm at the supracallosal portion (A4-A5) of the bihemispheric anterior cerebral artery (ACA), an ACA anomaly, and present that endovascular surgery was a good treatment even for peripheral cerebral aneurysm.

Case Presentation: A 53-year-old woman experienced a sudden onset of severe headache and vomiting. Plain CT scan revealed subarachnoid hemorrhage and hematoma in the supracallosal area.

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Three dimensional ordered subset expectation maximization (3D-OSEM) improves spatial resolution and contrast. Continuous acquisition, and step and shoot acquisition are used in single photon emission computed tomography (SPECT). The purpose of this study was to evaluate the effect of 3D-OSEM when acquisition method was different.

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In postoperative radiotherapy for seminoma, control of the testicular absorbed dose is important, since exposure of the testis can lead to temporary or permanent infertility. In this case, instead of using a dog-leg-shaped field, treatment using a field focused near the aorta was provided in several disease stages of seminoma. However, the precise need for testicular shielding during treatment and dose of testis exposure was not clear.

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The purpose of this study was to verify the dose absorbed by an implantable cardioverter defibrillator (ICD) from an (192)Ir sealed source during uterine intracavitary brachytherapy, and to confirm its immunity to radiation effects. First, prior to treatment, the doses around the ICD position of an anthromorphic phantom were evaluated. Next, we also measured the dose at the ICD position using a fluorescent glass dosimeter and silicon diode dosimeter during the treatment of intracavitary brachytherapy of a patient implanted with an ICD.

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The monitor unit (MU) was calculated by pencil beam convolution (inhomogeneity correction algorithm: batho power law) [PBC (BPL)] which is the dose calculation algorithm based on measurement in the past in the stereotactic lung irradiation study. The recalculation was done by analytical anisotropic algorithm (AAA), which is the dose calculation algorithm based on theory data. The MU calculated by PBC (BPL) and AAA was compared for each field.

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Article Synopsis
  • - The study aimed to compare two dose distribution algorithms for lung cancer SRT: pencil beam convolution with the Batho power low (PBC [BPL]) and anisotropic analytical algorithm (AAA).
  • - Significant differences were found in several dose evaluation metrics, showing that PBC (BPL) produced more uniform dose distributions within the planning target volume (PTV) compared to AAA.
  • - While there were no major differences in total lung dose, the AAA algorithm resulted in a smaller high-dose region around the PTV, indicating the importance of considering dose variations when switching algorithms.
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