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Articles by T Teshima
Total Records ( 2 ) for T Teshima
  T Toita , M Oguchi , T Ohno , S Kato , Y Niibe , T Kodaira , T Kazumoto , M Kataoka , N Shikama , M Kenjo , T Teshima and Y. Kagami
  Objective

To assess compliance with the radiotherapy protocol of a multi-institutional prospective study (JAROG0401/JROSG04-2), which investigated the efficacy and toxicity of definitive radiotherapy using high-dose-rate intracavitary brachytherapy (HDR-ICBT) for early-stage uterine cervical cancer patients.

Methods

Individual case reviews (ICRs) were performed on all 60 study participants. Radiotherapy data were submitted to the quality assurance (QA) committee, which performed ICRs on 16 QA items according to previously selected criteria. The items focused on quality of external beam radiotherapy (EBRT), HDR-ICBT and both. Each item was determined to be either acceptable or a deviation. The QA committee performed ICR three times as planned, two during the patient accrual and the final one just after the final patient accrued. The QA results of the first and second reviews were reported back to the investigators after each ICR.

Results

In 40 cases (67%), all 16 QA items were classified as acceptable. One deviation was found in 16 cases, two deviations were identified in 3 cases and three deviations were noted in 1 case. The most frequently observed deviation was missing the rules for determining point A (10 cases). The items described by quantitative values, such as prescribed doses, certain time intervals and overall treatment time, were well followed. The proportion of deviations gradually decreased during the ICR process.

Conclusions

The present ICR demonstrated the favorable radiotherapy compliance with the JAROG0401/JROSG04-2 protocol. The QA process using ICRs can potentially be used to improve the quality of radiotherapy, including HDR-ICBT in the multi-institutional prospective studies for cervical cancer.

  K Nakamura , K Ogawa , T Sasaki , H Onishi , M Koizumi , M Araya , N Mukumoto , M Mitsumori , T Teshima and Japanese Patterns of Care Study Working Subgroup of Prostate Cancer
  Objective

The purpose of this study is to identify the treatment planning process for Japanese patients with localized prostate cancer.

Methods

The Patterns of Care Study conducted a random survey of 61 institutions nationwide. Detailed information was collected on prostate cancer patients without distant metastases who were irradiated during the periods 2003–05. Radiation treatment planning and delivery were evaluated in 397 patients who were treated radically with external photon beam radiotherapy.

Results

Computed tomography data were used for planning in ~90% of the patients. Contrast was rarely used for treatment planning. Simulations and treatments were performed in the supine position in almost all patients. Immobilization devices were used in only 15% of the patients. Verification of the treatment fields using portal films or electric portal imaging devices was performed in most of the patients. However, regular or multiple verifications in addition to initial treatment and/or portal volume changes were performed in only 30% of the patients. Typical beam arrangements for treatment of the prostate consisted of a four-field box. Three-dimensional conformal techniques were applied less frequently in non-academic hospitals than in academic ones. Modernized multileaf collimators with leaf widths ≤10 mm were used in about two-thirds of the patients. Although the total doses given to the prostate were affected by the leaf widths, there were no significant differences between leaf widths of 5 and 10 mm.

Conclusions

The results of the survey identified certain patterns in the current treatment planning and delivery processes for localized prostate cancer in Japan.

 
 
 
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