Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
Volume 66, Issue 2
Displaying 1-7 of 7 articles from this issue
Opening Article
Originals
  • Yohei Watanabe, Yuichiro Hayashi, Masazumi Fujii, Miyuki Kimura, Akihi ...
    2010 Volume 66 Issue 2 Pages 131-136
    Published: February 20, 2010
    Released on J-STAGE: March 04, 2010
    JOURNAL FREE ACCESS
    An image-guided neurosurgery and neuronavigation system based on magnetic resonance imaging has been used as an indispensable tool for resection of brain tumors. Therefore, accuracy of the neuronavigation system, provided by periodic quality assurance (QA), is essential for image-guided neurosurgery. Two types of accuracy index, fiducial registration error (FRE) and target registration error (TRE), have been used to evaluate navigation accuracy. FRE shows navigation accuracy on points that have been registered. On the other hand, TRE shows navigation accuracy on points such as tumor, skin, and fiducial markers. This study shows that TRE is more reliable than FRE. However, calculation of TRE is a time-consuming, subjective task. Software for QA was developed to compute TRE. This software calculates TRE automatically by an image processing technique, such as automatic template matching. TRE was calculated by the software and compared with the results obtained by manual calculation. Using the software made it possible to achieve a reliable QA system.
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  • Keiichi Shida, Mutsumi Yamamoto, Chiharu Matsumoto, Yumiko Uto, Ichiro ...
    2010 Volume 66 Issue 2 Pages 137-143
    Published: February 20, 2010
    Released on J-STAGE: March 04, 2010
    JOURNAL FREE ACCESS
    Recently, the environment of medical treatment in our country has become more strict. The purpose of this study is to find changes in the implementation of diagnostic imaging from the point of view of cost analysis, through the use of diagnosis procedure combination (DPC) data. The patient data has been extracted from the DPC data. We compared patients (n=693) in terms of their daily income, cost, and image examination cost ratio for malignant tumors in lungs. The results of this study indicated the ratio of the image examination cost of 040040xx99100x was 25.2% in the old grading sheet. The ratio of the image examination cost increased 42.4% in the new grading sheet. The implementation of diagnostic imaging was able to be made visible simply by analyzing the cost. We found one of the methodologies that connected the improvement of that standard treatment with the examination of each DPC.
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Note
  • Toru Hirano, Akiko Kumagai, Mizuho Suzuki, Syuichi Honma, Tosiaki Miya ...
    2010 Volume 66 Issue 2 Pages 144-152
    Published: February 20, 2010
    Released on J-STAGE: March 04, 2010
    JOURNAL FREE ACCESS
    To improve of cerebral blood vessel visualization and reduce cone beam artifacts from high absorbance materials such as bone structure in 3D-CTA of cerebral blood vessels, we suggest that a non-helical overlapping scan (NHOS) be used. We found that the NHOS and the conventional helical scan optimized the conditions for clinical use of the NHOS. Z-resolution in the NHOS was much higher than that in the non-helical scan without slice overlap. FWHM of the NHOS were thin, about 47%, in comparison with that of the helical scan, and NHOS was superior in Z-resolution to that of the helical scan. Moreover, the NHOS had very few artifacts caused by the skull, and was useful for 3D-CTA of cerebral blood vessels.
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