Faculty Profiles - NAGANAWA, Shinji

Papers - NAGANAWA, Shinji

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MR imaging of the inner ear: comparison of a three-dimensional fast spin-echo sequence with use of a dedicated quadrature-surface coil with a gadolinium-enhanced spoiled gradient-recalled sequence. Reviewed

Naganawa S, Ito T, Fukatsu H, Ishigaki T, Nakashima T, Ichinose N, Kassai Y, Miyazaki M

Radiology Vol. 208 ( 3 ) page： 679-685 1998

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

PURPOSE: To prospectively evaluate the sensitivity and specificity of magnetic resonance (MR) imaging in the inner ear with a long echo train, three-dimensional (3D), asymmetric Fourier-transform, fast spin-echo (SE) sequence with use of a dedicated quadrature-surface phased-array coil to detect vestibular schwannoma in the cerebellopontine angle and the internal auditory canal. MATERIALS AND METHODS: In 205 patients (410 ears) with ear symptoms, 1.5-T MR imaging was performed with unenhanced 3D asymmetric fast SE and gadolinium-enhanced 3D gradient-recalled (SPGR) sequences with use of a quadrature surface phased-array coil. The 3D asymmetric fast SE images were reviewed by two radiologists, with the gadolinium-enhanced 3D SPGR images used as the standard of reference. RESULTS: Nineteen lesions were detected in the 410 ears (diameter range, 2-30 mm; mean, 10.5 mm +/- 6.4 [standard deviation]; five lesions were smaller than 5 mm). With 3D asymmetric fast SE, sensitivity, specificity, and accuracy, respectively, were 100%, 99.5%, and 99.5% for observer 1 and 100%, 99.7%, and 99.8% for observer 2. CONCLUSION: The unenhanced 3D asymmetric fast SE sequence with a quadrature-surface phased-array coli allows the reliable detection of vestibular schwannoma in the cerebellopontine angle and internal auditory canal.

DOI： 10.1148/radiology.208.3.9722845

分岐型ステントグラフトを留置した腹部大動脈瘤の１例

岩井宏悦、石口恒男、鈴木耕次郎、新畑昌滋、長縄慎二、丸山邦弘、石垣武男、小林英昭、松下昌裕、櫻井恒久

映像情報メディカル Vol. 30 page： 753-755 1998

フェリデックス投与後のT1強調像が評価に有用であった2例

深津博、長縄慎二　岩山恵理子、石垣武男

映像情報メディカル Vol. 30 page： 1030-1032 1998

3D-fast spin echo法を用いた小脳橋角部のMR cisternography

映像情報メディカル Vol. 29 ( 6 ) page： 341-343 1997

Cerebral black blood MR angiography with the interleaved multi-slab three-dimensional fast spin echo sequence. Reviewed

Naganawa S, Ito T, Shimada H, Nagao R, Endo T, Uchiumi K, Ishigaki T

Radiat Med Vol. 15 ( 6 ) page： 385-388 1997

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

To overcome the disadvantages of conventional three-dimensional time-of-flight MR angiography (3D-TOF), such as saturation or intravoxel dephasing, black blood MR angiography (BB-MRA) using an interleaved multi-slab 3D fast spin echo sequence was developed and evaluated clinically. In major branches, the contrast-to-noise ratio of the flow was not as good as 3D-TOF in BB-MRA. However, in-plane slow flow and large aneurysm were visualized better on BB-MRA than on 3D-TOF. Furthermore, BB-MRA could provide wider coverage than 3D-TOF. BB-MRA using interleaved multi-slab 3D fast spin echo is now feasible and complementary to 3D-TOF.

著明な心、肺血管内進展を示した肺門部腫瘍の１例

河津省司、伊藤都紀子、加藤加代子、稲垣弘、長縄慎二、丸山邦弘、深津博、石口恒男、小林英敏、石垣武男、碓氷章彦、吉田光伸

映像情報メディカル Vol. 29 page： 1542-1545 1997

High speed and high resolution MR imaging og the inner ear asinng ultra-long echo train length 3D fast spin echo sequence and half Eonrier imaging

Proceedings of ISMRM page： 631 1996

MR imaging of the primary breast lymphoma

Breast Cancer Vol. 3 ( 3 ) page： 209-213 1996

従来型CT装置における造形剤投与法の腹部域での検討

映像情報メディカル Vol. 28 ( 3 ) page： 332-335 1996

High resolution T₂ weighted MR imaging of the inner ear using a long echo train length 3D fast spin echo sequence

European Radiology ( 6 ) page： 369-374 1996

MR lmaging of the Primary Breast Lymphoma: A Case Report. Reviewed

Naganawa S, Endo T, Aoyama H, Ichihara S

Breast Cancer Vol. 3 ( 3 ) page： 209-213 1996

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Recently magnetic resonance (MR) imaging has been investigated for the detection and differentiation of benign and malignant breast lesions. Dynamic scan using the contrast material has been shown to increase the specificity of breast MR imaging. Primary breast lymphoma (PBL) is a rare disease and its MR imaging finding has not been described before. We recently experienced a case of PBL that was demonstrated on MR imaging as an early enhancing mass similar to common carcinomas. Other imaging findings including sonography, mammography were also non-specific. Furthermore, lymphoma cells had spread beyond the early enhanced area. Thus the precise delineation of the tumor extent was impossible. However, features such as a quite unclear border on pre-contrast T2-weighted image, and increased uptake of gallium-67-citrate may allow diagnosis of such lesions as malignant lymphoma.

High-resolution T2-weighted MR imaging of the inner ear using a long echo-train-length 3D fast spin-echo sequence.

Naganawa S, Yamakawa K, Fukatsu H, Ishigaki T, Nakashima T, Sugimoto H, Aoki I, Miyazaki M, Takai H

Eur Radiol Vol. 6 ( 3 ) page： 369-374 1996

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

The purpose of this study was to assess the value of a long echo-train-length 3D fast spin-echo (3D-FSE) sequence in visualizing the inner ear structures. Ten normal ears and 50 patient ears were imaged on a 1.5T MR unit using a head coil. Axial high-resolution T2-weighted images of the inner ear and the internal auditory canal (IAC) were obtained in 15 min. In normal ears the reliability of the visualization for the inner ear structures was evaluated on original images and the targeted maximum intensity projection (MIP) images of the labyrinth. In ten normal ears, 3D surface display (3D) images were also created and compared with MIP images. On the original images the cochlear aqueduct, the vessels in the vicinity of the IAC, and more than three branches of the cranial nerves were visualized in the IAC in all the ears. The visibility of the endolympathic duct was 80%. On the MIP images the visibility of the three semicircular canals, anterior and posterior ampulla, and of more than two turns of the cochlea was 100%. The MIP images and 3D images were almost comparable. The visibility of the endolymphatic duct was 80% in normal ears and 0% in the affected ears of the patients with Meniere's disease (p < 0.01). In one patient ear a small intracanalicular tumor was depicted clearly. In conclusion, the long echo train length T2-weighted 3D-FSE sequence enables the detailed visualization of the tiny structures of the inner ear and the IAC within a clinically acceptable scan time. Furthermore, obtaining a high contrast between the soft/bony tissue and the cerebrospinal/endolymph/ perilymph fluid would be of significant value in the diagnosis of the pathologic conditions around the labyrinth and the IAC.

副乳腺に発生した乳癌の一例.

林崎理子、遠藤登喜子、長縄慎二、青山英昭、関谷正徳、長田和久、市原周.

映像情報メディカル Vol. 28 page： 735-738 1996

High resolution T-2 weighted image of the inner ear with 3D-Fast Spin echo sequence

European Radiology Vol. 5 ( Suppl ) page： 366 1995

High resolution MR imaging of the inner ear using 3D-ESE

Nippon Acta Radiologica Vol. 55 ( 1 ) page： 81-82 1995

Internal anotomy of the inner ear at MR imaging with a Long-Echo-Train-Length 3D,Fast SE sequence

Radiology Vol. 197 ( 9 ) page： 134-135 1995

Visualization of the internal anatomy of the inner ear using a long echo train length 3D fast spin echo sequence

Proceedings of SMR page： 230 1995

Inner ear barotrauma: computed tomographic evaluation. Reviewed

Nakashima T, Yanagita N, Yamakawa K, Naganawa S

Clin Otolaryngol Allied Sci Vol. 20 ( 6 ) page： 544-546 1995

Language：English Publishing type：Research paper (scientific journal)

Eight patients with inner ear barotrauma were evaluated by computed tomography. The causes of the inner ear barotrauma were diving in four, flying in an airplane in three, and climbing in one. Regarding the width of the cochlear aqueduct, no significant difference was observed between the affected side (3.28 +/- 0.49 mm) and non-affected side (3.63 +/- 0.79 mm) at the base of the infundibulum. The jugular fossa could not be identified on the affected side in three patients. Some relationship may exist between inner ear barotrauma and poor development of the jugular fossa.

DOI： 10.1111/j.1365-2273.1995.tb01598.x

High resolution MR imaging of the inner ear apparatus using 3D-Fast spin echo sequence Reviewed

Naganawa S, Senda K, Yamakawa K, Fukatsu H, Ishigaki T, Nakashima T, Sugimoto H, Aoki I, Takai H

Nippon Igaku Hoshasen Gakkai Zasshi Vol. 55 ( 1 ) page： 81-82 1995

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

To evaluate the efficacy of high resolution MR imaging of the inner ear with 3D-Fast spin echo sequence, one volunteer and 12 patients were imaged with a 1.5 T MR scanner. High resolution T2-weighted images were obtained with a head coil in 13 minutes, and the voxel size was 0.39mm x 0.45mm x 1.2mm in most subjects. Original images and maximum intensity projection (MIP) images of the inner ear were evaluated. On original images, the endolymphatic duct was visualized in 72% of subjects, the cochlear aqueduct in 96%, three branches of the cranial nerves in the internal auditory canal in 100%, and flow void of the vessel in the cerebellopontine angle in 100%. On MIP images, more than two cochlear turns were visualized in 92% of subjects, three semicircular canals in 100%, and the anterior and posterior ampulla in 100%. MR imaging of the inner ear with 3D-Fast Spin Echo sequence provides a variety of useful information regarding the anatomy around the inner ear.

Flow velocity and volume measurement of superior and interior mesenteric artery with cine phase contrast magnetic resonance imaging

Radiation Medicine Vol. 12 ( 5 ) page： 213-220 1994

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Papers - NAGANAWA, Shinji