Publications by authors named "T Maebayashi"
This study was conducted to evaluate the use of 4-dimensional (4D) maximum intensity projection (4D-MIP) to compensate for the disadvantages of average intensity projection (AIP), which is used to determine the internal target volume (ITV) in lung tumors. A respiratory motion phantom with a simulated tumor was imaged using 4D computed tomography (4D-CT). AIP and 4D-MIP were generated based on 10 phases of 4D-CT, followed by contouring of the ITV and ITV; these were compared with the ITV contoured in 10 phases of 4D-CT (ITV).
View Article and Find Full Text PDFPurpose: To reduce the rectal radiation dose during local radiation therapy of prostate cancer, a hydrogel spacer is typically implanted between the prostate and rectum. However, the spacer volume can change during external beam radiation therapy (EBRT). Therefore, we used magnetic resonance imaging (MRI) to determine changes in the spacer volume during EBRT and analyzed the data to identify patient factors influencing this change.
View Article and Find Full Text PDFArticle Synopsis
- Primary testicular lymphoma (PTL) is rare, and patients often receive radiation therapy to the contralateral testis to prevent relapse after achieving remission.
- A 76-year-old man treated for PTL developed a new mass in the glans penis 6.5 years later, prompting investigation into whether it was a relapse or a new cancer.
- Genomic analysis revealed that the penile lymphoma shared genetic similarities with the original PTL, confirming it as a relapse, marking it as the first reported case of PTL returning in the glans penis.
Purpose: This retrospective study aimed to identify the factors associated with cavity formation after SBRT in peripheral early-stage lung cancer patients. We analyzed the occurrence of cavity changes after SBRT.
Materials And Methods: We examined 99 cases with T1-T2aN0 peripheral non-small cell lung cancer treated with SBRT from 2004 to 2021.
Background: Administration of adjuvant or salvage radiotherapy (RT) after prostate cancer (PCa) surgery is supported by clinical evidence and is a widely adopted strategy. On occasion, we detect changes in prostate-specific antigen (PSA) levels, such as a transient elevation or decline, during RT. Thus, we retrospectively investigated the frequency of changes in PSA levels, their associations with histopathological parameters, PSA doubling time (PSADT), and biochemical recurrence (BR) of PCa.
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