Details of a Researcher - Jinzaki, Masahiro

Papers - Jinzaki, Masahiro

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The analysis of the cerebral venous blood volume in cavernous sinus using 320 row multi-detector CT

Mizutani K., Toda M., Yajima Y., Akiyama T., Fujiwara H., Yoshida K., Jinzaki M.

Clinical Neurology and Neurosurgery (Clinical Neurology and Neurosurgery) 167 11 - 16 2018.04

ISSN 03038467

© 2018 Elsevier B.V. Objectives: : Functional venous anatomy in the brain has been mostly understood from the morphological and embryological points of view and no published study has directly evaluated the blood flow volume of cerebral small veins. We developed a method to directly evaluate the relative blood volume in small venous channels using multi-detector computed tomography (CT) and applied it to evaluate the blood volume in each tributary of the cavernous sinus, which plays an important role in cerebral venous drainage. Patients and Methods: : Ten patients with small brain tumors who had normal venous anatomy were included in the present study. All of them underwent preoperative 320-row multi-detector CT. After injecting the contrast bolus, we measured the Hounsfield units (HUs) at 10 time point over 60 s in each tributary of the cavernous sinus. The gamma distribution fitting to each HU enabled us to obtain a time-density curve and determine the relative venous volume in each venous channel. Results: : In terms of blood volume, the superficial middle cerebral vein and inferior petrosal sinus were the largest inflow and outflow channels of the cavernous sinus and accounted for 36.1% and 24.7% of its inflow and outflow on average, respectively. The superior orbital vein did not contribute to the blood volume passing through the cavernous sinus in the current study. Conclusions: : The present study allowed us to determine the relative blood volume in each tributary of the cavernous sinus, which was very useful to understand the physiological actual venous drainage pattern concerning the cavernous sinus in normal anatomy.

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Comparison of fluorine-18 fluorodeoxyglucose positron emission tomography with gallium-67 scintigraphy in the initial clinical staging of diffuse large B-cell lymphoma

Sakurai M., Toyama T., Kikuchi T., Kato J., Shimizu T., Koda Y., Karigane D., Yamane Y., Abe R., Yamazaki R., Nakazato T., Nakahara T., Jinzaki M., Okamoto S., Mori T.

International Journal of Hematology (International Journal of Hematology) 107 ( 2 ) 194 - 200 2018.02

ISSN 09255710

© 2017, The Japanese Society of Hematology. Fluorine-18 fluorodeoxyglucose (FDG) positron emission tomography (PET) has been recommended as a complementary tool for the staging of various malignancies, including malignant lymphoma. PET findings often shift patients to higher stages and may affect treatment outcomes. In this study, we retrospectively compared staging and treatment outcomes of newly diagnosed diffuse large B-cell lymphoma (DLBCL) assessed by PET (n = 153) or gallium-67 scintigraphy (Ga) (n = 95). In total, Ga upstaged two (2.1%) of 95 patients, whereas PET upstaged 13 (8.5%) of 153 patients. Bone/bone marrow (15 vs. 4%, P = 0.01) and muscle lesion (5 vs. 0%, P = 0.03) were identified more frequently in the PET group than in the Ga group. The estimated 3-year overall and progression-free survival rates did not differ significantly in the two groups at any stage. However, patients with stage III disease tended to have better progression-free survival in the PET group than in the Ga group [92.3 (95% CI 56.6–98.9%) vs. 58.3% (95% CI 27.0–80.1%), P = 0.086]. These results suggest that PET has a greater potential in detecting musculoskeletal lesions of DLBCL as extranodal lesions than Ga, and may contribute to the optimal staging.

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特集大動脈疾患の画像診断:画像所見・画像からみた自然史・治療効果判定慢性期・高齢者の大動脈病変

伊東伸剛, 陣崎雅弘

臨床画像 ((株)メジカルビュー社) 34 ( 1 ) 30 - 38 2018.01

ISSN 0911-1069

特集大血管CTの必須知識─治療に直結する最新の情報も含めて─ TAVI術前評価

山田祥岳, 山田稔, 松本俊亮, 中原健裕, 鈴木達也, 橋本正弘, 林田健太郎, 陣崎雅弘

画像診断 (学研メディカル秀潤社) 38 ( 2 ) 164 - 179 2018.01

ISSN 0285-0524

High-Energy Collimator Is Preferable to Medium-Energy Collimator for Evaluating 223Ra Uptake in Bone Metastasis at 2 Weeks Postinjection

Ichimura A., Nakahara T., Owaki Y., Nakajima K., Jinzaki M.

Clinical nuclear medicine (Clinical nuclear medicine) 43 ( 1 ) 71 - 72 2018.01

An 80-year-old man with castration-resistant prostate cancer received Ra injection to treat bone metastases. Two weeks after the injection, the patient underwent static Ra scan of the chest with medium-energy and high-energy collimators for 30 minutes each. Images obtained with the 2 collimators showed that uptake in metastatic lesions was visually clearer and semiquantitatively higher with the high-energy collimator. The use of HE collimator for Ra imaging in the early phase has been reported, and the present case suggests that in the late phase HE collimator would also be preferable to medium-energy collimator in terms of lesion-based evaluation.

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Preclinical evaluation of heat-denatured [18F]FDG-labeled red blood cells for detecting splenic tissues with PET in rats

Matsusaka Y., Nakahara T., Takahashi K., Iwabuchi Y., Ogata Y., Nishime C., Kajimura M., Jinzaki M.

Nuclear Medicine and Biology (Nuclear Medicine and Biology) 56 26 - 30 2018.01

ISSN 09698051

© 2017 Elsevier Inc. Introduction Heat-denatured 99mTc-labeled red blood cells (RBCs) are used for detecting splenic tissues with scintigraphy. The present study aimed to evaluate the feasibility of using heat-denatured [18F]fluorodeoxyglucose ([18F]FDG)-labeled RBCs in detecting splenic tissues using positron emission tomography (PET) in rats. Methods RBCs were washed with phosphate buffered saline, labeled with [18F]FDG at 38°C, and heat-denatured at 50°C for 15 min. In vitro stability was assessed by measuring extracellular radioactivity during the 0–180 min incubation at 37°C. Thin layer chromatography (TLC) of the extracellular fluid was performed. The autologous RBCs were intravenously injected in four rats and PET scanning was simultaneously performed for 30 min. Time-activity curves of several organs, including the spleen, were analyzed on the PET images. Results Labeling efficiency was 92%. Low levels of radioactivity were released from the labeled RBCs for 180 min. TLC revealed that 80% of the released radioactivity was due to [18F]FDG-6-phosphate. Whole body images showed strong uptake of heat-denatured [18F]FDG-labeled RBCs in the spleen soon after injection in all four rats. Time-activity curves revealed that the splenic uptake continued to increase for 30 min and the amount of radioactivity in the other organs, except the urinary bladder, decreased after the initial surge. Conclusions Heat-denatured [18F]FDG-labeled RBCs are suitable spleen-specific agents for PET. This method is clinically relevant as an alternative for heat-denatured 99mTc-labeled RBC scintigraphy.

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Giant Cell Tumors of the Bone: Changes in Image Features after Denosumab Administration

Oguro Sota, Okuda Shigeo, Sugiura Hiroaki, Matsumoto Shunsuke, Sasaki Aya, Susa Michiro, Morioka Hideo, Jinzaki Masahiro

Magnetic Resonance in Medical Sciences (Japanese Society for Magnetic Resonance in Medicine) 17 ( 4 ) 325 - 330 2018

ISSN 13473182

Purpose: To assess the clinical importance in the feature change in giant cell tumors of the bone (GCTB) after denosumab treatment, detected by MRI.Methods: In 12 patients, MRI and CT of GCTB obtained before and after the treatment retrospectively compared. The tumor size, the signal intensity (SI) ratio between the solid part of the GCTB and muscle, cystic part size, gadolinium enhancement and apparent diffusion coefficient (ADC) value were measured on MRI. The bone formation in the tumor was observed on CT and X-ray.Results: The mean number of denosumab injections was 19 ± 10. The follow-up period was up to 2 years. One case showed partial remission, while the other 11 cases were stable. A mean SI ratio on T2-weighted image statistically significantly decreased from 3.9 to 1.9 after the treatment. A cystic component in the tumor was observed in five cases before the treatment, and the diameter of the cystic part decreased after the treatment in 80% of cases (4/5). All the tumors showed contrast enhancement on T1-weighted image pre- and post-treatment (11/11). The averaged ADC values were 1.52 × 10−3 mm2/s before and 1.44 × 10−3 mm2/s after the treatment (P = 0.63). Bone formation in the tumor was observed in 58% of cases (7/12).Conclusion: The decrease of SI ratio on T2-weighted image, shrinkage of cystic part and bone formation should be regarded as the effectiveness of denosumab treatment despite of no substantial change in the tumor size.

Diagnostic imaging of bladder cancer

Akita H., Iwabuchi Y., Jinzaki M.

Japanese Journal of Clinical Urology (Japanese Journal of Clinical Urology) 72 ( 7 ) 514 - 525 2018

ISSN 03852393

The added value of tomosynthesis in endoscopic retrograde cholangiography with radiography for the detection of choledocholithiasis

Suyama Y., Yamada Y., Yamaguchi H., Someya G., Otsuka S., Murayama Y., Shinmoto H., Jinzaki M., Ogawa K.

British Journal of Radiology (British Journal of Radiology) 91 ( 1087 ) 2018

ISSN 00071285

© 2018 The Authors. Objective: The diagnostic performance of endoscopic retrograde cholangiography (ERC) with radiography is imperfect. We assessed the value of adding tomosynthesis to ERC with radiography for the detection of choledocholithiasis. Methods: This study included 102 consecutive patients (choledocholithiasis/non-choledocholithiasis, n = 57/45), who underwent both radiography and tomosynthesis for ERC in the same examination and were not diagnosed with malignancy. The reference standard for the existence of choledocholithiasis was confirmed by endoscopic stone extraction during ERC, intraoperative cholangiography, or follow up with magnetic resonance cholangiopancreatography (n = 78, 11, and 13, respectively). A gastroenterologist and a radiologist independently evaluated the radiographs and the combination of tomosynthesis and radiographic images in a blinded and randomised manner. Receiver operating characteristic analysis was used for statistical analysis. Results: The areas under the receiver operating characteristic curve for combined tomosynthesis and radiography were significantly higher than those for radiography alone for both readers: Reader 1/ Reader 2, 0.929/0.956 [95% confidence interval (CI), 0.861-0.965/0.890-0.983) vs 0.803/0.769 (95% confidence interval, 0.707-0.873/0.668-0.846), respectively (p = 0.0047/> 0.0001). Conclusion: Adding tomosynthesis to radiography improved the diagnostic performance of ERC for detection of choledocholithiasis. Advances in knowledge: Adding tomosynthesis to radiography improves detection of choledocholithiasis and tomosynthesis images can be obtained easily after radiographs and repeated immediately.

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Use of a digital phantom developed by QIBA for harmonizing SUVs obtained from the state-of-the-art SPECT/CT systems: a multicenter study.

Nakahara T, Daisaki H, Yamamoto Y, Iimori T, Miyagawa K, Okamoto T, Owaki Y, Yada N, Sawada K, Tokorodani R, Jinzaki M.

EJNMMI Research (Springer) 7 ( 1 ) 53 2017.12

Research paper (scientific journal), Joint Work

BACKGROUND:

Although quantitative analysis using standardized uptake value (SUV) becomes realistic in clinical single-photon emission computed tomography/computed tomography (SPECT/CT) imaging, reconstruction parameter settings can deliver different quantitative results among different SPECT/CT systems. This study aims to propose a use of the digital reference object (DRO), which is a National Electrical Manufacturers Association (NEMA) phantom-like object developed by the Quantitative Imaging Biomarker Alliance (QIBA) fluorodeoxyglucose-positron emission tomography technical committee, for the purpose of harmonizing SUVs in Tc-99m SPECT/CT imaging.

METHODS:

The NEMA body phantom with determined Tc-99m concentration was scanned with the four state-of-the-art SPECT/CT systems. SPECT data were reconstructed using different numbers of the product of subset and iteration numbers (SI) and the width of 3D Gaussian filter (3DGF). The mean (SUVmean), maximal (SUVmax), and peak (SUVpeak) SUVs for six hot spheres (10, 13, 17, 22, 28, and 37 mm) were measured after converting SPECT count into SUV using Becquerel calibration factor. DRO smoothed by 3DGF with a FWHM of 17 mm (DRO17 mm) was generated, and the corresponding SUVs were measured. The reconstruction condition to yield the lowest root mean square error (RMSE) of SUVmeans for all the spheres between DRO17 mm and actual phantom images was determined as the harmonized condition for each SPECT/CT scanner. Then, inter-scanner variability in all quantitative metrics was measured before (i.e., according to the manufacturers' recommendation or the policies of their own departments) and after harmonization.

RESULTS:

RMSE was lowest in the following reconstruction conditions: SI of 100 and 3DGF of 13 mm for Brightview XCT, SI of 160 and 3DGF of 3 pixels for Discovery NM/CT, SI of 60 and 3DGF of 2 pixels for Infinia, and SI of 140 and 3DGF of 15 mm for Symbia. In pre-harmonized conditions, coefficient of variations (COVs) among the SPECT/CT systems were greater than 10% for all quantitative metrics in three of the spheres, SUVmax and SUVmean, in one of the spheres. In contrast, all metrics except SUVmax in the 17-mm sphere yielded less than 10% of COVs after harmonization.

CONCLUSIONS:

Our proposed method clearly reduced inter-scanner variability in SUVs. A digital phantom developed by QIBA would be useful for harmonizing SUVs in multicenter trials using SPECT/CT.

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18F-FDG-labeled red blood cell PET for blood-pool imaging: preclinical evaluation in rats.

Matsusaka Y, Nakahara T, Takahashi K, Iwabuchi Y, Nishime C, Kajimura M, Jinzaki M.

EJNMMI research (springer) 7 ( 1 ) 19 2017.12

Research paper (scientific journal), Joint Work

BACKGROUND:

Red blood cells (RBCs) labeled with single-photon emitters have been clinically used for blood-pool imaging. Although some PET tracers have been introduced for blood-pool imaging, they have not yet been widely used. The present study investigated the feasibility of labeling RBCs with 18F-2-deoxy-2-fluoro-D-glucose (18F-FDG) for blood-pool imaging with PET. RBCs isolated from venous blood of rats were washed with glucose-free phosphate-buffered saline and labeled with 18F-FDG. To optimize labeling efficiency, the effects of glucose deprivation time and incubation (labeling) time with 18F-FDG were investigated. Post-labeling stability was assessed by calculating the release fraction of radioactivity and identifying the chemical forms of 18F in the released and intracellular components of 18F-FDG-labeled RBCs incubated in plasma. Just after intravenous injection of the optimized autologous 18F-FDG-labeled RBCs, dynamic PET scans were performed to evaluate in vivo imaging in normal rats and intraabdominal bleeding models (temporary and persistent bleeding).

RESULTS:

The optimal durations of glucose deprivation and incubation (labeling) with 18F-FDG were 60 and 30 min, respectively. As low as 10% of 18F was released as the form of 18F-FDG from 18F-FDG-labeled RBCs after a 60-min incubation. Dynamic PET images of normal rats showed strong persistence in the cardiovascular system for at least 120 min. In the intraabdominal bleeding models, 18F-FDG-labeled RBC PET visualized the extravascular blood clearly and revealed the dynamic changes of the extravascular radioactivity in the temporary and persistent bleeding.

CONCLUSIONS:

RBCs can be effectively labeled with 18F-FDG and used for blood-pool imaging with PET in rats.

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特集知っておきたい泌尿器画像診断─新たな動向も含めて─ 副腎腫瘍の診断とIVR治療の動向

小黒草太, 有田祐起, 塚田実郎, 伊東伸剛, 井上政則, 中塚誠之, 陣崎雅弘

画像診断 (学研メディカル秀潤社) 37 ( 14 ) 1461 - 1470 2017.11

ISSN 0285-0524

特集知っておきたい泌尿器画像診断─新たな動向も含めて─ 序説

陣崎雅弘

画像診断 (学研メディカル秀潤社) 37 ( 14 ) 1425 - 1425 2017.11

ISSN 0285-0524

Incidental spade-shaped FDG uptake in the left ventricular apex suggests apical hypertrophic cardiomyopathy.

Katagiri M, Nakahara T, Murata M, Ogata Y, Matsusaka Y, Iwabuchi Y, Yamada Y, Fukuda K, Jinzaki M.

Annals of Nuclear Medicine (Springer) 31 ( 5 ) 399 - 406 2017.11

Research paper (scientific journal), Joint Work, ISSN 09147187

PURPOSE:

Apical wall thickening with an "ace-of-spades" configuration is a unique sign of apical hypertrophic cardiomyopathy (AHCM). We investigated spade-shaped FDG uptake around the left ventricular apex (SSUA) incidentally found in routine oncological FDG PET.

METHODS:

Cases showing SSUA were selected based on retrospective review. The pattern or intensity of SSUA was compared with the results of electrocardiogram (ECG), echocardiography, and stress myocardial perfusion SPECT. The diagnosis of ACHM was based on the presence of giant negative T wave in ECG, thickness of spade-shaped hypertrophy in the apex in echocardiography, and increased tracer uptake in the apex in rest SPECT.

RESULTS:

Among the 34 patients in 36 PET scans showing SSUA, SSUA was weak in 17 and intense in 17. There were isolated SSUA (n = 29) and SSUA with diffuse or other focal left ventricular uptake (n = 5). Three patients with the latter uptake pattern turned out to have coexistence of AHCM and asymmetric septal hypertrophy. Of the 16 SSUA-positive patients who underwent echocardiography, 13 (81%) were diagnosed as AHCM and the remaining 3 were regarded as borderline AHCM (apical wall thickness, 14-15 mm). There were 16 patients with SSUA who also underwent PET scans after the study period among which 11 (69%) had persistent SSUA in the follow-up PET. In the remaining 5, follow-up PET scans showed diffuse left ventricular uptake and SSUA was barely visible. The intensity of SSUA was significantly or marginally associated with giant negative T wave (p < 0.01), apical asynergy (p = 0.08), and impaired coronary flow reserve (p < 0.05). There were no other factors correlated with the pattern or intensity of SSUA.

CONCLUSION:

SSUA incidentally found in oncological FDG PET appeared to be associated with AHCM, especially in ischemic conditions. The moderate repeatability of SSUA was probably due to obscurity by physiological uptake.

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静荷重条件下におけるヒト足部と類人猿足部の3次元骨格運動の比較解析

伊藤幸太, 細田耕, 名倉武雄, 今西宣晶, 相磯貞和, 陣崎雅弘, 大石元治, 荻原直道

バイオメカニズム学術講演会予稿集 (バイオメカニズム学会) 38回 217 - 218 2017.11

特集薬物治療に起因する諸病態の画像所見胸部　薬物治療に関連する肺疾患

南康大, 杉浦弘明, 陣崎雅弘

臨床画像 ((株)メジカルビュー社) 33 ( 10 ) 1130 - 1143 2017.10

ISSN 0911-1069

特集泌尿器の画像診断と放射線治療画像診断　腎臓嚢胞性腎腫瘤

秋田大宇, 成田啓一, 陣崎雅弘

臨床放射線 (金原出版) 62 ( 11 ) 1331 - 1340 2017.10

ISSN 0009-9252

Three-dimensional innate mobility of the human foot bones under axial loading using biplane X-ray fluoroscopy

Ito K., Hosoda K., Shimizu M., Ikemoto S., Nagura T., Seki H., Kitashiro M., Imanishi N., Aiso S., Jinzaki M., Ogihara N.

Royal Society Open Science (Royal Society Open Science) 4 ( 10 ) 171086 2017.10

The anatomical design of the human foot is considered to facilitate generation of bipedal walking. However, how the morphology and structure of the human foot actually contribute to generation of bipedal walking remains unclear. In the present study, we investigated the three-dimensional kinematics of the foot bones under a weight-bearing condition using cadaver specimens, to characterize the innate mobility of the human foot inherently prescribed in its morphology and structure. Five cadaver feet were axially loaded up to 588N (60 kgf), and radiographic images were captured using a biplane X-ray fluoroscopy system. The present study demonstrated that the talus is medioinferiorly translated and internally rotated as the calcaneus is everted owing to axial loading, causing internal rotation of the tibia and flattening of the medial longitudinal arch in the foot. Furthermore, as the talus is internally rotated, the talar head moves medially with respect to the navicular, inducing external rotation of the navicular and metatarsals. Under axial loading, the cuboid is everted simultaneously with the calcaneus owing to the osseous locking mechanism in the calcaneocuboid joint. Such detailed descriptions about the innate mobility of the human foot will contribute to clarifying functional adaptation and pathogenic mechanisms of the human foot.

Ra-223 SPECT for semi-quantitative analysis in comparison with Tc-99m HMDP SPECT: phantom study and initial clinical experience.

Owaki Y1,2, Nakahara T3, Kosaka T4, Fukada J1, Kumabe A1, Ichimura A, Murakami M, Nakajima K, Fukushi M, Inoue K, Oya M, Jinzaki M.

EJNMMI Research (Springer) 7 ( 1 ) 81 2017.10

Research paper (scientific journal), Joint Work

BACKGROUND:
Image-based measurement of absorbed dose of Ra-223 dichloride may be useful in predicting therapeutic outcome in patients with castration-resistant prostate cancer (CRPC). In general, SPECT has been found to be more accurate than planar imaging in terms of lesion-based analysis. The aims of this study were to assess the feasibility and clinical usefulness of Ra-223 SPECT. The energy spectrum of Ra-223 and SPECT images of a cylindrical phantom with a hot rod were obtained to determine the collimator candidates and energy window settings suitable for clinical Ra-223 SPECT (basic study A). Another phantom with a tube-shaped chamber and two spheres simulating bowel activity and metastatic lesions in the lumbar spine was scanned with medium-energy general-purpose (MEGP) and high-energy general-purpose (HEGP) collimators (basic study B). Ten patients with CRPC underwent SPECT imaging 2 h after Ra-223 injection successively with MEGP and HEGP collimators in random order for 30 min each. Lesion detectability and semi-quantitative analyses of bone metastasis (i.e. lesion-to-background ratio (LBR)) were performed compared to Tc-99m HMDP SPECT.
RESULTS:
Basic study A revealed that an 84-keV photopeak ± 20% using the HEGP collimator offers better SPECT image quality than the other imaging conditions. Basic study B showed that uptake in one of the spheres was overestimated by overlapped activity of the tube-shaped chamber in planar imaging whereas the spheres had similar counts and significantly higher sphere-to-background ratio in SPECT. On both planar and SPECT images, HEGP gave higher image contrast than MEGP (p < 0.01). In the clinical study, Ra-223 SPECT at 84 keV ± 20% depicted more lesions with the HEGP than with the MEGP collimator (51 vs 36, p = 0.013). There was a positive correlation between LBR in Tc-99m SPECT and in Ra-223 SPECT (r = 0.67 with the MEGP and 0.69 with the HEGP collimator, p < 0.01). LBRs were significantly higher with the HEGP than with the MEGP collimator (p < 0.01).
CONCLUSIONS:
We recommended the use of the HEGP collimator at 84 keV ± 20% for Ra-223 SPECT imaging. Lesion-based semi-quantitative analysis in the human study revealed a good correlation between Ra-223 and Tc-99m HMDP SPECT in the early phase (2-3 h post injection).

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特集放射線科研修医の胸腹部画像診断must know 腹部・骨盤部　腎臓　腎腫瘍に特徴的な所見

荒井学, 成田啓一, 秋田大宇, 陣崎雅弘

臨床画像 ((株)メジカルビュー社) 33 ( 14 ) 138 - 150 2017.10

ISSN 0911-1069

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