Faculty Profiles - NAGANAWA, Shinji

Papers - NAGANAWA, Shinji

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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

Rapid MR imaging of the liver

Radiation Medicine Vol. 12 ( 6 ) page： 255-261 1994

Magnetic Resonance imaging of the endolymphotic duct and sae in Meniere's disease

Auris-Nasus-Larynx Vol. 19 ( supl. ) page： 81-87 1992

MRI of the vestibular aquaduct

Nippon Acta Radiologica Vol. 51 ( 3 ) page： 213-218 1991

Evaluation of clearance function of the Eustachian tube by sequential contrast CT. Reviewed

Niwa H, Takahashi M, Yanagita N, Naganawa S

Acta Otolaryngol Suppl Vol. 471 page： 43-50 1990

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

Comparisons of Eustachian tube (ET) functions studied by sequential contrast computerized tomography (CT) and by tubotympanic aerodynamics (TTAG) were made. ET clearance function was assessed by the shape of the cartilaginous portion before, during and at the end of swallowing; ventilatory function was studied by TTAG. ET clarity, real-time dynamics and resolution were all better when observed with sequential CT. Contrast medium was instilled into the middle ear via a drumhead perforation and 1 scan/sec taken during swallowing. We classified ET function based on the presence or absence of a) movement of the cartilaginous portion, and b) contrast medium in the ET as i) movement present, contrast medium seen in ET: ii) movement absent, contrast medium present in ET; and iii) movement present, no contrast medium in the ET. Ventilatory and clearance functions did not parallel one another, attributable to some mechanical, differences between the two functions.

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