Naoko Hashimoto

Nissay Hospital, Ōsaka, Ōsaka, Japan

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Publications (15)22.15 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: We aimed to investigate the feasibility of using vessel-detection software to identify damaged arteries during endovascular embolization in five patients with visceral arterial hemorrhages. We used a software program originally developed to detect tumor feeder vessels in liver tumor embolization with C-arm computed tomography datasets to detect the vessels responsible for the arterial hemorrhages in patients with splenic artery pseudoaneurysms (n=2), lower gastrointestinal bleeding (n=2), and bladder tumor bleeding (n=1). In all cases, the injured vessel was identified accurately on a three-dimensional vascular map at the optimal working angle with a relatively short mean processing time of 118 s (range, 107-136 s). The operating angiographers used this information to direct the catheter into the damaged artery without sequential angiographic runs. The software analysis was also used to plan coil delivery to the most appropriate site in the injured artery. The results suggest that the vessel-detection software for liver tumor embolization can also be used to detect damaged vessels and to plan treatment strategies in endovascular embolization of visceral arterial hemorrhage.
    Diagnostic and interventional radiology (Ankara, Turkey) 12/2013; · 1.03 Impact Factor
  • J Iwazawa, S Ohue, N Hashimoto, T Mitani
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    ABSTRACT: To compare the accuracy of computer software analysis using three different target-definition protocols to detect tumour feeder vessels for transarterial chemoembolization of hepatocellular carcinoma. C-arm computed tomography (CT) data were analysed for 81 tumours from 57 patients who had undergone chemoembolization using software-assisted detection of tumour feeders. Small, medium, and large-sized targets were manually defined for each tumour. The tumour feeder was verified when the target tumour was enhanced on selective C-arm CT of the investigated vessel during chemoembolization. The sensitivity, specificity, and accuracy of the three protocols were evaluated and compared. One hundred and eight feeder vessels supplying 81 lesions were detected. The sensitivity of the small, medium, and large target protocols was 79.8%, 91.7%, and 96.3%, respectively; specificity was 95%, 88%, and 50%, respectively; and accuracy was 87.5%, 89.9%, and 74%, respectively. The sensitivity was significantly higher for the medium (p = 0.003) and large (p < 0.001) target protocols than for the small target protocol. The specificity and accuracy were higher for the small (p < 0.001 and p < 0.001, respectively) and medium (p < 0.001 and p < 0.001, respectively) target protocols than for the large target protocol. The overall accuracy of software-assisted automated feeder analysis in transarterial chemoembolization for hepatocellular carcinoma is affected by the target definition size. A large target definition increases sensitivity and decreases specificity in detecting tumour feeders. A target size equivalent to the tumour size most accurately predicts tumour feeders.
    Clinical radiology 10/2013; · 1.65 Impact Factor
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    ABSTRACT: PURPOSE: To evaluate the clinical utility and limitations of a computer software program for detecting tumor feeders of hepatocellular carcinoma (HCC) during transarterial chemoembolization (TACE). MATERIALS AND METHODS: Forty-six patients with 59 HCC nodules underwent nonselective digital subtraction angiography (DSA) and C-arm computed tomography (CT) in the same hepatic artery. C-arm CT data sets were analyzed using the software to identify potential tumor feeders during each TACE session. For DSA analysis, 3 radiologists were independently assigned to identify tumor feeders using the DSA images in a separate session. The sensitivity of the 2 techniques in detecting tumor feeders was compared, with TACE findings as the reference standard. Factors affecting the failure of the software to detect tumor feeders were assessed by univariate and multivariate analyses. RESULTS: We detected 65 tumor feeders supplying 59 HCC nodules during TACE sessions. The sensitivity of the software to detect tumor feeders was significantly higher than that of the manual assessment using DSA (87.7% vs. 71.8%, P<0.001). Multivariate analysis showed that a tumor feeder diameter of <1.0mm (hazard ratio [HR], 56.3; P=0.003) and lipiodol accumulation adjacent to the tumor (HR, 11.4; P=0.044) were the significant predictors for failure to detect tumor feeders. CONCLUSION: The software analysis was superior to manual assessment with DSA in detecting tumor feeders during TACE for HCC. However, the capability of the software to detect tumor feeders was limited by vessel caliber and by prior lipiodol accumulation to the tumor.
    European journal of radiology 06/2013; · 2.65 Impact Factor
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    ABSTRACT: AIM: We aimed to evaluate hepatic vascular changes following lipiodol-based transarterial chemoembolization of hepatocellular carcinoma using epirubicin (EPI), miriplatin (MPT) and miriplatin plus low-dose epirubicin (MPT+EPI). METHODS: A total of 185 arteries in 118 patients who underwent chemoembolization using EPI (67 arteries in 48 patients), MPT (64 arteries in 37 patients) and MPT+EPI (54 arteries in 33 patients) were retrospectively examined. The maximum dose limit of MPT was 140 mg and that of EPI was 50 and 20 mg for the EPI and MPT+EPI groups, respectively. Vascular changes and local recurrence were evaluated by subsequent angiography. Factors affecting arterial damage were analyzed using multivariate logistic regression analysis. RESULTS: More severe arterial damage was observed in the EPI group (88.1%) than in the MPT+EPI (72.2%) and the MPT (18.7%) groups (P = 0.044 and P < 0.001, respectively). EPI usage (hazard ratio [HR] = 12.8, P < 0.001), selective chemoembolization (HR = 5.4, P < 0.001) and MPT usage (HR = 0.28, P = 0.020) were significant predictors for arterial damage induction. The local recurrence rate was lower for the lesions exhibiting arterial occlusion after chemoembolization (39.4%) than for the lesions exhibiting no vascular attenuation (73.9%) or wall irregularity (75.8%) (P = 0.001 and P = 0.005, respectively). CONCLUSION: High-dose EPI, MPT, and low-dose EPI plus MPT usage in chemoembolization for hepatocellular carcinoma induced the greatest, the least, and intermediate vascular damages, respectively. Therapeutic occlusion of tumor feeder vessels is associated with lower local recurrence.
    Hepatology Research 03/2013; · 2.07 Impact Factor
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    ABSTRACT: Purpose. To compare the number of image acquisitions and procedural time required for transarterial chemoembolization (TACE) with and without tumor-feeder detection software in cases of hepatocellular carcinoma (HCC). Materials and Methods. We retrospectively reviewed 50 cases involving software-assisted TACE (September 2011-February 2013) and 84 cases involving TACE without software assistance (January 2010-August 2011). We compared the number of image acquisitions, the overall procedural time, and the therapeutic efficacy in both groups. Results. Angiography acquisition per session reduced from 6.6 times to 4.6 times with software assistance (P < 0.001). Total image acquisition significantly decreased from 10.4 times to 8.7 times with software usage (P = 0.004). The mean procedural time required for a single session with software-assisted TACE (103 min) was significantly lower than that for a session without software (116 min, P = 0.021). For TACE with and without software usage, the complete (68% versus 63%, resp.) and objective (78% versus 80%, resp.) response rates did not differ significantly. Conclusion. In comparison with software-unassisted TACE, automated feeder-vessel detection software-assisted TACE for HCC involved fewer image acquisitions and could be completed faster while maintaining a comparable treatment response.
    Radiology research and practice. 01/2013; 2013:580839.
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    ABSTRACT: We aimed to evaluate local tumor control after transarterial chemoembolization (TACE) for hepatocellular carcinoma using miriplatin and low-dose epirubicin combination therapy. We retrospectively analyzed the records of patients who underwent TACE using miriplatin plus low-dose epirubicin (30 patients, 61 nodules, August 2011-March 2012) and control patients who underwent TACE using miriplatin alone (36 patients, 70 nodules, June 2010-July 2011). The local control rate was compared between the two groups using the Kaplan-Meier estimator and the log-rank test. Factors affecting local tumor recurrence were analyzed using multivariate logistic regression analysis. Treatment-related toxicity was evaluated using the Common Terminology Criteria for Adverse Events. The local control rates at 6 months and 1 year were 87% and 65% for the miriplatin plus low-dose epirubicin group, and 61% and 43% for the miriplatin group, respectively. Local tumor control rates were significantly better in the miriplatin plus low-dose epirubicin group than in the miriplatin group (P = 0.038). Multivariate analysis showed that the addition of epirubicin was an independent factor associated with better local tumor control (hazard ratio 0.2, P = 0.001). Overall incidence rates for adverse events were not significantly different between the two groups. Additional usage of low-dose epirubicin for TACE using miriplatin improved local tumor control of hepatocellular carcinoma with adverse effects comparable to those observed with TACE using miriplatin alone.
    OncoTargets and Therapy 01/2013; 6:1025-30. · 2.07 Impact Factor
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    ABSTRACT: Aim: To evaluate the initial safety and efficacy of combination therapy using miriplatin plus low-dose epirubicin for transarterial chemoembolisation (TACE) of unresectable hepatocellular carcinoma (HCC). Patients who underwent TACE using miriplatin plus epirubicin (n=48) and control patients who underwent TACE using miriplatin-alone (n=51) were included in this study. The objective response rate in the miriplatin plus epirubicin group (91%) was significantly higher than that in the miriplatin group (74%, p=0.024). Concomitant use of miriplatin and epirubicin was an independent factor associated with higher objective response rate (hazard ratio=0.18; p=0.012). Overall incidence adverse events was not significantly different between the miriplatin plus epirubicin group (50%) and the miriplatin group (49%, p=0.575). TACE using miriplatin plus low-dose epirubicin was associated with an increased objective response rate and comparable adverse effects compared to TACE using miriplatin-alone.
    Anticancer research 11/2012; 32(11):5039-44. · 1.71 Impact Factor
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    ABSTRACT: The aim of this preliminary study was to evaluate the feasibility of assessing ablation margins after radiofrequency ablation (RFA) of liver tumors from fusion images of post-treatment C-arm computed tomography (CT) images fused to pretreatment images. Five patients with liver tumors underwent RFA. Intravenous contrast-enhanced C-arm CT images were obtained for all patients immediately after RFA, and multi-detector CT (MDCT) images were obtained 3-7 days later. The C-arm CT and MDCT images were fused to pretreatment images using a multimodality image fusion software. The minimum ablation margins were assessed in the C-arm CT and MDCT fusion images. Ablation margins after RFA of liver tumors can be measured using intravenous contrast-enhanced C-arm CT images fused with pretreatment images. This technique has the potential for use in the intra-procedural assessment of liver tumor ablation.
    Indian Journal of Radiology and Imaging 10/2012; 22(4):251-3.
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    ABSTRACT: PURPOSE: To compare patient survival after transarterial chemoembolization with and without intraprocedural C-arm computed tomography (CT) in patients with unresectable hepatocellular carcinoma. MATERIALS AND METHODS: We retrospectively reviewed the records of 130 patients with unresectable hepatocellular carcinoma who underwent lipiodol-based chemoembolization using a C-arm cone-beam system. We compared patients who underwent chemoembolization with angiography alone (69 patients; April 2005-July 2007) to those who underwent C-arm CT-assisted chemoembolization (61 patients; July 2007-April 2010). Overall and local progression-free survivals were compared using the Kaplan-Meier estimator with log-rank testing. Univariate and multivariate analyses were performed using the Cox proportional hazards model. RESULTS: Overall survival rates of patients who underwent chemoembolization with and without C-arm CT assistance were 94% and 79%, 81% and 65%, and 71% and 44% at 1, 2, and 3 years, respectively. Local progression-free survival rates of these patients were 43% and 27%, 31% and 10%, and 26% and 5% at 1, 2, and 3 years, respectively. Patients receiving C-arm CT-assisted chemoembolization had significantly higher overall (P=0.005) and local progression-free (P=0.003) survival rates than those receiving chemoembolization with angiography alone. Multivariate analysis showed that C-arm CT assistance was an independent factor associated with longer overall survival (hazard ratio, 0.40; P=0.033) and local progression-free survival (hazard ratio, 0.25; P=0.003). CONCLUSION: C-arm CT usage in addition to angiography during transarterial chemoembolization prolongs survival in patients with unresectable hepatocellular carcinoma.
    European journal of radiology 09/2012; · 2.65 Impact Factor
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    ABSTRACT: To evaluate the feasibility of intravenous contrast-enhanced C-arm computed tomography (CT) for assessing ablative areas and margins of liver tumors. Twelve patients (5 men, 7 women; mean age, 69.5 years) who had liver tumors (8 hepatocellular carcinomas, 4 metastatic liver tumors; mean size, 16.3 mm; size range, 8-20 mm) and who underwent percutaneous radiofrequency ablations (RFAs) with a flat-detector C-arm system were retrospectively reviewed. Intravenously enhanced C-arm CT and multidetector computed tomography (MDCT) images were obtained at the end of the RFA sessions and 3-7 d after RFA to evaluate the ablative areas and margins. The ablated areas and margins were measured using axial plane images acquired by both imaging techniques, with prior contrast-enhanced MDCT images as the reference. The sensitivity, specificity, and positive and negative predictive values of C-arm CT for detecting insufficient ablative margins (< 5 mm) were calculated. Statistical differences in the ablative areas and margins evaluated with both imaging techniques were compared using a paired t-test. All RFA procedures were technically successful. Of 48 total ablative margins, 19 (39.6%) and 20 (41.6%) margins were found to be insufficient with C-arm CT and MDCT, respectively. Moreover, there were no significant differences between these 2 imaging techniques in the detection of these insufficient ablative margins. The sensitivity, specificity, and positive and negative predictive values for detecting insufficient margins by C-arm CT were 90.0%, 96.4%, 94.7% and 93.1%, respectively. The mean estimated ablative areas calculated from C-arm CT (462.5 ± 202.1 mm(2)) and from MDCT (441.2 ± 212.5 mm(2)) were not significantly different. The mean ablative margins evaluated by C-arm CT (6.4 ± 2.2 mm) and by MDCT (6.0 ± 2.4 mm) were also not significantly different. The efficacy of intravenous contrast-enhanced C-arm CT in assessing the ablative areas and margins after RFA of liver tumors is nearly equivalent to that of MDCT.
    World journal of radiology. 03/2012; 4(3):109-14.
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    ABSTRACT: We aimed to compare the local control rates between miriplatin and epirubicin in lipiodol-based transarterial chemoembolization (TACE) for hepatocellular carcinoma (HCC). Patients who underwent targeted TACE using miriplatin (47 patients, 66 lesions) or epirubicin (64 patients, 79 lesions) as the sole therapy were enrolled. The local control rates were compared using the Kaplan-Meier estimator with the log-rank test. The patient and tumor parameters were subjected to univariate and multivariate analyses using the Cox proportional hazards model. The overall local recurrence rates were 39.3% and 31.6% for the miriplatin and epirubicin groups, respectively. The local control rate was significantly higher in the epirubicin group than in the miriplatin group (P < 0.001). The local control rates at 6 months and 1 year were 70.7% and 44.8% for the miriplatin group and 83.4% and 69.2% for the epirubicin group, respectively. Multivariate analysis showed that the serum α-fetoprotein level ≥ 20 ng/mL (hazard ratio 2.96; P < 0.001), miriplatin usage (hazard ratio 2.53; P = 0.002), and Child-Pugh class B (hazard ratio 1.89; P = 0.042) affected local progression. Lipiodol-based targeted TACE using miriplatin had inferior local control rates as compared to epirubicin in patients with HCC.
    Cancer Management and Research 01/2012; 4:113-9.
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    ABSTRACT: The aim of this study was to compare the accuracy, sensitivity, and positive predictive value of C-arm CT with those of MDCT in the detection of hepatocellular carcinoma. We retrospectively evaluated the cases of 50 patients with nodules of hepatocellular carcinoma who underwent biphasic MDCT and selective C-arm CT with flat-detector angiographic systems. We evaluated arterial phase C-arm CT images and the corresponding biphasic MDCT images of 59 hepatic areas in 50 patients. Three independent blinded observers rated both sets of images using a detection confidence scale. The diagnostic accuracy of the two techniques was compared on the basis of area under alternative free-response receiver operating characteristic curve (A(1)). Focal accumulation of iodized oil was the reference standard. Accuracy was significantly higher for C-arm CT (A(1) = 0.830) than for MDCT (A(1)= 0.618) for lesions smaller than 10 mm in diameter (p < 0.001), but the accuracy of the two techniques did not differ significantly for lesions measuring 10 mm or larger. C-arm CT was significantly more sensitive than MDCT in the detection of lesions 20 mm or smaller (74.1% vs 34.0% for lesions < 10 mm [p < 0.001]; 94.7% vs 77.1% for lesions 10-20 mm [p < 0.001]). The positive predictive values of the two techniques did not differ significantly irrespective of lesion size. Compared with biphasic MDCT, C-arm CT depicted hepatocellular carcinoma lesions smaller than 10 mm with more accuracy and those 20 mm and smaller with more sensitivity. The two techniques were equally accurate in the detection of hepatocellular carcinoma lesions 10 mm in diameter and larger.
    American Journal of Roentgenology 10/2010; 195(4):882-7. · 2.90 Impact Factor
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    ABSTRACT: An 86-year-old man with dysphagia underwent gastrointestinal fiberscopy (GIF) and was found to have a circumferential type 3 advanced carcinoma in the upper thoracic esophagus and a type 2 tumor in the posterior wall of the gastric body. Microscopic examination of biopsy specimens of both tumors demonstrated moderately differentiated squamous cell carcinoma. He was diagnosed as having stage IVb (T3N0M1b) esophageal carcinoma with gastric wall metastasis. A total of 60 Gy in 30 fractions of three-dimensional conformal radiation therapy (3D-CRT) was first administered to the esophageal carcinoma, next to the gastric wall metastasis. Concurrent chemotherapy was not given because of the patient's refusal. No subjective morbidity was observed during the treatment. In the GIF study immediately after 3D-CRT, both esophageal and gastric wall tumors had attained a complete response. The dysphagia dissolved as the esophageal tumor shrunk. The patient has been doing well for 17 months after the start of 3D-CRT. No local recurrence was observed in either the esophagus or the stomach during follow-up GIF. Considering the dismal prognosis of esophageal carcinoma patients with intramural metastasis to the stomach, a watchful follow-up is needed.
    Japanese journal of radiology 04/2010; 28(3):227-30. · 0.73 Impact Factor
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    Journal of vascular and interventional radiology: JVIR 03/2010; 21(3):412-4. · 1.81 Impact Factor
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    ABSTRACT: This study compares the diagnostic accuracy of C-arm CT with digital subtraction angiography (DSA) in identifying tumor-feeding arteries during superselective transarterial chemoembolization (TACE). Thirty-three consecutive patients with hepatocellular carcinoma (HCC) underwent superselective TACE using a flat-detector angiographic system. Angiographic operators determined which feeding arteries were potentially supplying the target tumor. When two or more feeding arteries were possible, all were included. Superselective DSA and C-arm CT were sequentially performed for each studied artery. Four independent observers separately viewed the DSA and C-arm CT images and used a 5-point grading scale to determine whether a studied artery supplied the target tumor. Diagnostic performance was compared using receiver operating characteristic (ROC) analysis. Sensitivity, specificity, and accuracy were calculated for arteries rated as definite or probable tumor feeders. Iodized oil accumulation on follow-up CT was the reference standard. We examined 58 possible feeding arteries in 33 patients. Among the studied arteries, follow-up CT confirmed that 33 were verified tumor-feeding arteries, and the remaining 25 were not. C-arm CT resulted in a significantly larger area under the ROC curve (A(z) = 0.995) compared with DSA (A(z) = 0.841). The sensitivity, specificity, and accuracy of C-arm CT (96.9%, 97.0%, and 96.9%, respectively) were significantly higher than those for DSA (77.2%, 73.0%, and 75.4%). C-arm CT is superior to DSA for identifying tumor-feeding arteries during superselective TACE for HCC.
    American Journal of Roentgenology 05/2009; 192(4):1057-63. · 2.90 Impact Factor