日本放射線技術学会雑誌
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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68 巻, 4 号
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巻頭言
原著
  • Scapula-45撮影法における肩甲上腕関節描出体位の検討
    藤澤 宏信, 加藤 京一, 西村 裕樹, 西中 直也, 三原 研一, 筒井 廣明, 中澤 靖夫
    2012 年 68 巻 4 号 p. 397-403
    発行日: 2012/04/20
    公開日: 2012/04/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.4.397
    ジャーナル フリー
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    Scapula-45 is an original roentogenographical technique to clarify objectively the function of the rotator cuff and scapulothoracic joint. This examination enables assessment of the function of the rotator cuff and scapulothoracic joint utilizing the radiographs of the glenohumeral joint. However, in the former technique, it was difficult for the technician to properly align the patient for the view of the true glenohumeral joint because of the individual postural difference of the patients, such as kyphosis. In the present study, we reported a new technique with the use of the acromion, coracoid process, and inferior angle of the scapula as a landmark to obtain the consistent radiographs of the glenohumeral joint.
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  • 逐次近似再構成法を応用した新しい画像再構成法に対する画質評価
    高田 忠徳, 市川 勝弘, 林 弘之, 三井 渉, 作田 啓太, 越田 晴香, 横井 知洋, 松原 孝祐, 堀井 純清, 飯田 泰治
    2012 年 68 巻 4 号 p. 404-412
    発行日: 2012/04/20
    公開日: 2012/04/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.4.404
    ジャーナル フリー
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    The purpose of this study was to evaluate the image quality of an iterative reconstruction method, the iterative reconstruction in image space (IRIS), which was implemented in a 128-slices multi-detector computed tomography system (MDCT), Siemens Somatom Definition Flash (Definition). We evaluated image noise by standard deviation (SD) as many researchers did before, and in addition, we measured modulation transfer function (MTF), noise power spectrum (NPS), and perceptual low-contrast detectability using a water phantom including a low-contrast object with a 10 Hounsfield unit (HU) contrast, to evaluate whether the noise reduction of IRIS was effective. The SD and NPS were measured from the images of a water phantom. The MTF was measured from images of a thin metal wire and a bar pattern phantom with the bar contrast of 125 HU. The NPS of IRIS was lower than that of filtered back projection (FBP) at middle and high frequency regions. The SD values were reduced by 21%. The MTF of IRIS and FBP measured by the wire phantom coincided precisely. However, for the bar pattern phantom, the MTF values of IRIS at 0.625 and 0.833 cycle/mm were lower than those of FBP. Despite the reduction of the SD and the NPS, the low-contrast detectability study indicated no significant difference between IRIS and FBP. From these results, it was demonstrated that IRIS had the noise reduction performance with exact preservation for high contrast resolution and slight degradation of middle contrast resolution, and could slightly improve the low contrast detectability but with no significance.
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  • k空間データの極座標変換を用いたMRI画像再構成法
    橘 篤志, 橋本 雄幸, 坂口 和也, 小畠 隆行, 篠原 広行
    2012 年 68 巻 4 号 p. 413-421
    発行日: 2012/04/20
    公開日: 2012/04/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.4.413
    ジャーナル フリー
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    In this study, we proposed the new reconstruction techniques for magnetic resonance imaging (MRI) using filtered back projection (FBP) or simultaneous reconstruction technique (SIRT). We converted the k-space which was acquired by conventional phase-encoding schemes from Cartesian coordinates to polar coordinates and created the projection. The linear interpolation and the sinc interpolation were used in the conversion. The accuracy of the reconstructed image using projection was evaluated by the relative error in comparison with the standard image which was reconstructed by the two-dimensional Fourier transform (2DFT) with conventional Cartesian k-space. The relative error reconstructed both FBP and SIRT from projection with sinc interpolation is 0.013. The maximum value of standard image is 1.501451, FBP is 1.47921, and SIRT with iteration 100 is 1.44858 and with iteration 200 is 1.579442. The minimum value of both the standard image and the others is about 0. Visually, there is no margin between the standard image and the reconstructed image from projection with FBP or SIRT.
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  • 一般撮影における胸腹部欠像画像の検出を目的とした検像支援システムの開発
    渋谷 徹, 加藤 京一, 江島 豪一, 隅 真一郎, 久保 聡, 石田 秀樹, 中澤 靖夫
    2012 年 68 巻 4 号 p. 422-431
    発行日: 2012/04/20
    公開日: 2012/04/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.4.422
    ジャーナル フリー
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    In order to provide a precise radiography for diagnosis, it is required that we avoid radiography with defects by having enough evaluation. Conventionally, evaluation was performed only by observation of a radiological technologist (RT). The evaluation support system was developed for providing a high quality assurance without depending on RT observation only. The evaluation support system, called as the Image Quality Assurance Support System (IQASS), is characterized in that “image recognition technology” for the purpose of diagnostic radiography of chest and abdomen areas. The technique of the system used in this study. Of the 259 samples of posterior-anterior (AP) chest, lateral chest, and upright abdominal x-rays, the sensitivity and specificity was 93.1% and 91.8% in the chest AP, 93.3% and 93.6% in the chest lateral, and 95.0% and 93.8% in the upright abdominal x-rays. In the light of these results, it is suggested that AIQAS could be applied to practical usage for the RT.
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  • 320-row Multi Detector Computed Tomographyにおけるノンヘリカルスキャンの物理特性
    瓜倉 厚志, 中屋 良宏, 市川 勝弘, 川谷 圭亮, 川嶋 一平, 後藤 弘徳
    2012 年 68 巻 4 号 p. 432-442
    発行日: 2012/04/20
    公開日: 2012/04/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.4.432
    ジャーナル フリー
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    Recently, clinical applications utilizing 320-row multi detector computed tomography (320MDCT) have increased, and the physical image properties of 320MDCT have been more concerned. We evaluated the spatial resolution in scan plane and z-direction, image noise and low-contrast sensitivity of non-helical mode (320NH), 640 slices mode by a double slice reconstruction technology (640DS), and 64-row helical mode (64HE) by using a 320MDCT. The spatial resolution in z-direction was evaluated by the section sensitivity profile (SSP) measurement with the micro coin phantom and the contrast transfer ratio (CTR) with the 0.5-mm comb phantom. The in-plane spatial resolution of 320NH was uniform over all the slice positions. The spatial resolution in z-direction decreased from the cathode side toward the anode side. The image noise of the anode side was higher than that of the cathode side. The contrast to noise ratio as index of the low contrast sensitivity was uniform over all the slice position. The CTR of 320NH fluctuated in the z-position, and the fluctuation was improved by 640DS except for the center of rotation.
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ノート
  • IMRT線量検証における二次元検出器間の精度比較
    中口 裕二, 荒木 不次男, 雑賀 俊二, 河野 友宏, 丸山 雅人, 筧 清孝, 永末 望, 橋田 昌弘
    2012 年 68 巻 4 号 p. 443-452
    発行日: 2012/04/20
    公開日: 2012/04/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.4.443
    ジャーナル フリー
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    The dosimetric properties between various 2D array detectors were compared and were evaluated with regard to the accuracy in absolute dose and dose distributions for clinical treatment fields. We used to check the dose accuracy: 2D array detectors; MapCHECK (Sun Nuclear), EPID (Varian Medical Systems), EPID-based dosimetry (EPIDose, Sun Nuclear), COMPASS (IBA) and conventional system; EDR2 film (Eastman Kodak), Exradin A-14SL ion chamber (0.016 cc, Standard Imaging). First, we compared the dose linearity, dose rate dependence, and output factor between the 2D array detectors. Next, the accuracy of the absolute dose and dose distributions were evaluated for clinical fields. All detector responses for the dose linear were in agreement within 1%, and the dose rate dependence and output factor agreed within a standard deviation of ±1.2%, except for EPID. This is because EPID is fluence distributions. In all the 2D array detectors, the point dose agreed within 5% with treatment planning system (TPS). Pass rates of each detector for TPS were more than 97% in the gamma analysis (3 mm/3%). EPIDose was in a good agreement with TPS. All 2D array detectors used in this study showed almost the same accuracy for clinical fields. EPIDose has better resolution than other 2D array detectors and thus this is expected for dose distributions with a small field.
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  • Gradient Echo型Multi-shot EPIを用いた 2D-TOF下肢動脈撮像の検討
    中島 浩樹, 上山 毅
    2012 年 68 巻 4 号 p. 453-460
    発行日: 2012/04/20
    公開日: 2012/04/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.4.453
    ジャーナル フリー
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    In general, gradient echo (GRE) is used for the echo acquisition of two-dimensional time-of-flight (2D-TOF). It takes time to the image acquisition by 2D-TOF. Then, we designed the use of GRE-echo planar imaging (EPI) to the echo collections of 2D-TOF. We compared two pulse sequences using the following: contrast, signal to noise ratio, the distortions, and magnetic resonance angiography (MRA) images. The signal intensity ratio between blood vessel and fat was superior to the GRE-EPI. Signal to noise ratio of GRE-EPI was inferior to GRE. When the number of collection echoes of GRE-EPI is carried out by four, there was no distortion. The contrast of the blood vessel has improved when GRE-EPI was used. Image acquisition time improved to about 23 percent earlier. The blood vessel of the parent trunk was able to be described in the image of the lower limbs blood vessel. However, the description of the peripheral vessel was dominant 2D-TOF that used GRE. In clinical, the description of the peripheral vessel may not be important. With such a case, this method is effective. Moreover, shortening the image acquisition time brings a reduction to the load of the patient.
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臨床技術
  • 乳がんセンチネルリンパ節シンチグラフィにおける半仰臥位正面像撮像体位の有用性
    市原 裕紀, 小野口 昌久, 日吉 和久, 齋藤 知子, 阿部 俊子
    2012 年 68 巻 4 号 p. 461-467
    発行日: 2012/04/20
    公開日: 2012/04/20
    DOIhttps://doi.org/10.6009/jjrt.2012_JSRT_68.4.461
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    Objectives: Sentinel lymphoscintigraphy(SLSG) is focused on the visualization of an injection site and lymph nodes. Therefore, an anterior view is effective in identifying the location of a lymph node easily. For this reason, we devised a new imaging method of anterior view (Modified Anterior View; MAV), and the usefulness was assessed. Methods: SLSG was obtained in 166 patients with breast cancer. In MAV imaging, patients were laid in an oblique position on a triangular styrene foam elevating the target axillary side. The detector was also leaned. Just after the MAV were imaged, the patient was shifted to the supine position and the SAV imaging was also performed using the same acquisition times. Results: The detectability of MAV and SAV was 92.42% and 81.99%, respectively. However, the detectability of SAV showed the better value for the few cases which the lymph node detected by the inside of injection site. Conclusion: MAV may improve detectability of SLN. However, SAV is still required for a few cases in which lymph node is detected by the inside of injection site.
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資料
第39回秋季学術大会
シリーズ企画―乳腺の診断から治療まで―
臨床技術講座
バーチャルインタビュー大学院・研究室紹介
JIRAトピックス
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