Publications by authors named "Tsutomu Maruta"

Article Synopsis
  • The study evaluates how different air CT numbers in the image value density table (IVDT) impact dose calculations for head-and-neck radiotherapy using TomoTherapy megavoltage CT (MVCT) images.
  • Two IVDTs with distinct air CT numbers are applied to MVCT images of a phantom, allowing for a comparison of dose distributions between different planning scenarios.
  • Results indicate that one IVDT provided more accurate dose recalculations compared to the other, improving the alignment with treatment planning doses derived from kVCT images.
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We report three cases of hepatic artery pseudoaneurysm, which were all treated successfully using a combination of coil embolization and a side-holed 5F indwelling catheter for maintaining minimal hepatic artery blood flow with exclusion of the pseudoaneurysm. The tip of an infusion catheter was placed in the right hepatic artery and a side hole was positioned at the celiac axis. Coil embolization was then performed from the proper to the common hepatic artery using detachable coils.

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Objective: To investigate the efficacy and feasibility of a cisplatin-based concurrent chemoradiotherapy (CRT) protocol based on Intergroup Study 0099 for nasopharyngeal carcinoma (NPC).

Methods: Sixteen patients with stage II-IVB NPC were treated with a protocol of cisplatin-based concurrent CRT and adjuvant chemotherapy from 1998 to 2002. Three courses of cisplatin (80 mg/m2) were scheduled during 70 Gy of radiotherapy (RT), and two agents of adjuvant chemotherapy (FP regimen: cisplatin 80 mg/m2 and 5-fluorouracil 800 mg/m2/day by 4-day continuous infusion) were challenged.

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Pseudothrombocytopenia (PTCP) is the in vitro phenomenon of anticoagulant-activated platelet agglutination that results in spuriously low platelet counts. We report the case of a 65-year-old man with EDTA- and sodium citrate-dependent PTCP occurring after transcatheter arterial embolization (TAE) for hepatocellular carcinoma (HCC) due to hepatitis C cirrhosis. Invasion of the portal and hepatic veins by HCC formed severe trans-tumoral arterio-venous shunts that were effectively treated by TAE.

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Forty-two patients with stage IE ocular adnexal mucosa-associated lymphoid tissue (MALT) lymphoma were retrospectively analyzed. Five-year local control and progression-free survival rates were 100 and 77%, respectively. The most common relapsed site was the contralateral orbit.

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A 42-year-old woman with bilateral massive ovarian edema (MOE) is presented. MOE is usually seen in women 6 to 33 years of age. Therefore, accurate re-operative assessment of MOE is important to avoid unnecessary oophorectomy procedures.

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We report a case of ureteral-iliac artery fistula and its minimally invasive management with endovascular stent grafting. A 76-year-old male was admitted with massive gross hematuria from an ilial conduit. He underwent a radical cystectomy with ileal loop urinary diversion for bladder cancer 7 months ago and had undergone placement of a 7 Fr single-J ureteral catheter for repair of a partial disruption of the left ureteroileal anastomosis.

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Purpose: The purpose of this study was to investigate the incidence and possible predictors of hypothyroidism after radiotherapy to the neck, focusing on radiation dose-volume factors.

Methods And Materials: Thyroid function was measured in 169 patients treated with radiation ports including the thyroid, between 1989 and 2000. Hypothyroidism was determined with an endpoint of elevated serum thyroid stimulating hormone(TSH) levels > 10.

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We reviewed the records of 36 patients with medically inoperable stage I-II non-small cell lung carcinoma who were treated with radiotherapy. The median dose to the target was 60 Gy with conventional fractionation. Fifteen patients were treated without elective irradiation fields, while the remaining 21 were treated with extended fields including elective mediastinal regional lymph nodes.

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Purpose: To improve the reliability of the patient model and reduce treatment volume by acquiring multi-slice computed tomographic (CT) data with the patients' single holding of breath at normal inhalation and exhalation.

Methods And Materials: Seven patients with nine small peripheral lung cancer tumors underwent CT scanning under three respiration conditions using multi-slice CT: free breathing (FB), shallow inspiration (SI), and shallow expiration (SE). To compare the treatment plan created using the two-respiratory-phase images (SI + SE) with the plans created using only SE images or using only FB images, we attempted to calculate the true dosimetric characteristics for three-dimensional treatment planning taking respiratory movement into consideration.

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