日本放射線技術学会雑誌
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
検索
詳細検索
OR
閲覧
検索
66 巻, 12 号
選択された号の論文の21件中1～21を表示しています
すべての抄録を表示する
    • |<
    • <
    • 1
    • >
    • >|
巻頭言
原著
  • 冠動脈MDCT撮影におけるプロプラノロール静注の有用性と安全性
    関根 貴子, 児玉 隆秀, 近藤 武, 藤本 進一郎, 松谷 英幸, 新井 雄大, 森田 ひとみ, 佐野 始也, 斉藤 祐二, 高瀬 真一
    2010 年 66 巻 12 号 p. 1539-1547
    発行日: 2010/12/20
    公開日: 2011/01/26
    DOIhttps://doi.org/10.6009/jjrt.66.1539
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    Background: A low heart rate (HR), associated with a prolonged slow filling phase (SF), is necessary to obtain a high quality coronary CT at a low radiation dose with conventional 64 multidetector-row computed tomography (MDCT). The purpose of our study was to confirm the safety of injecting propranolol (2–10 mg) into the vein for lowering heart rate in patients requiring MDCT and to document the effect of the drug on HR, PQ and SF. Method: Of 1290 consecutive patients who were initially considered for enrollment in the coronary MDCT study, 40 patients with atrial fibrillations, 3 with atrial flutters, and 13 with artificial pacemakers were excluded. Of the remaining 1234 patients (M/F=714/520), 331 had already taken an oral beta-blocker before the CT examination, and were included in the study. In patients with no contraindications, propranolol was aggressively injected (2–10 mg) into the vein to reduce the HR. Result: In patients not taking an oral beta blocker, 2 mg propranolol reduced the HR by -10±5 bpm and 10 mg, by -20±7 bpm. However, in patients taking an oral beta-blocker, the decrease in HR by propranolol was minimal (2 mg, -6±4 bpm; 10 mg, -10±6 bpm). Propranolol significantly prolonged the PQ interval (from 169±27 to 179±29 ms, P<0.0001), and SF (from 125±69 to 264±79 ms, P<0.0001). Adverse effects of propranolol injection were observed in only 3 [2 mild hypotension and 1 paroxysmal atrial fibrillation (recovered to sinus rhythm by DC counter shock)] of 3212 patients. All 3 patients became stable after 1 or 2 hours of rest and could return home. Conclusion: Propranolol injection was a relatively safe and useful method to reduce HR and prolong SF, necessary for obtaining high quality coronary MDCT with a low radiation dose.
    抄録全体を表示
    PDF形式でダウンロード (712K)
  • 320列面検出器CTを用いた前向き心電図同期1心拍冠動脈撮影による被ばく低減効果－64列MDCTとの対比－
    松谷 英幸, 佐野 始也, 近藤 武, 藤本 進一郎, 関根 貴子, 新井 雄大, 森田 ひとみ, 高瀬 真一
    2010 年 66 巻 12 号 p. 1548-1554
    発行日: 2010/12/20
    公開日: 2011/01/26
    DOIhttps://doi.org/10.6009/jjrt.66.1548
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    Background: A high radiation dose associated with 64 multidetector-row computed tomography (64-MDCT) is a major concern for physicians and patients alike. A new 320 row area detector computed tomography (ADCT) can obtain a view of the entire heart with one rotation (0.35 s) without requiring the helical method. As such, ADCT is expected to reduce the radiation dose. We studied image quality and radiation dose of ADCT compared to that of 64-MDCT in patients with a low heart rate (HR≤60). Methods: Three hundred eighty-five consecutive patients underwent 64-MDCT and 379 patients, ADCT. Patients with an arrhythmia were excluded. Prospective ECG-gated helical scan with high HP (FlashScan) in 64 was used for MDCT and prospective ECG-gated conventional one beat scan, for 320-ADCT. Image quality was visually evaluated by an image quality score. Radiation dose was estimated by DLP (mGy･cm) for 64-MDCT and DLP.e (mGy･cm) for 320-ADCT. Results: Radiation dose of 320-ADCT (208±48 mGy･cm) was significantly (P<0.0001) lower than that of 64-MDCT (484±112 mGy･cm), and image quality score of 320-ADCT (3.0±0.2) was significantly (P=0.0011) higher than that of 64-MDCT (2.9±0.4). Scan time of 320-ADCT (1.4±0.1 s) was also significantly (P<0.0001) shorter than that of 64-MDCT (6.8±0.6 s). Conclusions: 320-ADCT can achieve not only a reduction in radiation dose but also a superior image quality and shortening of scan time compared to 64-MDCT.
    抄録全体を表示
    PDF形式でダウンロード (516K)
ノート
  • 診断用X線領域に対する無鉛ボードの遮へい評価
    加藤 洋, 塚田 勝, 三田 創吾, 福士 政広, 乳井 嘉之, 安部 真治, 木村 純一
    2010 年 66 巻 12 号 p. 1555-1560
    発行日: 2010/12/20
    公開日: 2011/01/26
    DOIhttps://doi.org/10.6009/jjrt.66.1555
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    For physical foundation data used in the shielding calculation of structural facilities such as a radiation room, there are air kerma transmissions concerning the thickness of shielding objects, and half value layers and tenth value layers concerning a greatly attenuated wide X-ray beam. Accordingly, we evaluated the above-mentioned items with a lead-free board, which is mixed sulfuric acid calcium and barium sulfate with equiponderance for the amount of sulfuric acid calcium included in the usual plasterboard. Permeability in NCRP Report 147 is expressed by 3 parameters, α, β and γ, and shielding objects x. It showed that it corresponds to the measurement point and permeability curve with parameters, α, β and γ obtained by nonlinear regression analysis. Furthermore, we calculated the half value layer and tenth value layer concerning the greatly attenuated wide X-ray beam. The evaluated lead-free board, used in this examination, is useful as the shielding material for the diagnosis X-ray and, moreover, the partition wall materials are hard enough, with a board that is even heavier than the usual plaster board. Besides, the use of lead-free materials is friendly to the general environment.
    抄録全体を表示
    PDF形式でダウンロード (447K)
  • デジタルファントムと臨床画像を用いた肝臓領域における低コントラスト分解能の評価
    原田 耕平, 宮下 宗治, 平野 雄士, 片倉 俊彦
    2010 年 66 巻 12 号 p. 1561-1568
    発行日: 2010/12/20
    公開日: 2011/01/26
    DOIhttps://doi.org/10.6009/jjrt.66.1561
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    The high performance of multi detector-row computed tomography (MDCT), enables a flow dynamic study of the liver that can be carried out within 10 seconds per one phase. In addition, it has been possible to obtain a stable image quality by utilizing the auto exposure control system. However, no clear standard of minimal CT value differences and minimal tumor sizes for detecting liver tumors has ever been shown. In order to help in their standardization, we developed novel software to make an arbitrary digital phantom. The limit of space occupied lesion (SOL) detection in each image quality could be determined by a detection study using digital phantoms superimposed on liver CT images. As a result, the detection rate of simulated tumors was significantly different, in comparisons of different image qualities for the late arterial phase and in comparison between the late arterial and equilibrium phases for the same image quality. Our method could help standardize the scan conditions for performing a liver CT.
    抄録全体を表示
    PDF形式でダウンロード (677K)
  • 反射型Radiochromic filmにおけるモアレアーチファクト除去法の検討
    辰己 大作, 中田 良成, 正井 範尚, 榎原 靖彦, 井上 誠, 市田 隆雄, 細野 雅子
    2010 年 66 巻 12 号 p. 1569-1576
    発行日: 2010/12/20
    公開日: 2011/01/26
    DOIhttps://doi.org/10.6009/jjrt.66.1569
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    An optical interference-pattern, a moire artifact, is produced during the film scanning process using a flatbed scanner. Images with moire artifacts include optical density fluctuations thereby leading to inaccuracy of measurement. In this study, we proposed two methods for removing moire artifacts from radiochromic film and compared dose response and profile as well as image resolution and size between our proposed methods versus the conventional process. The proposed methods could remove the artifacts without impairing dosimetric performance. It is expected that the proposed methods facilitate more accurate film dosimetry with reflective radiochromic films.
    抄録全体を表示
    PDF形式でダウンロード (700K)
臨床技術
  • 3T MRIにおける造影 Adamkiewicz Artery撮像法の検討
    平田 恵哉, 高橋 優, 近越 紗詠子, 中村 映水, 西尾 寛
    2010 年 66 巻 12 号 p. 1577-1586
    発行日: 2010/12/20
    公開日: 2011/01/26
    DOIhttps://doi.org/10.6009/jjrt.66.1577
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    Contrast enhanced magnetic resonance angiography (CE-MRA) is a common method for imaging the Adamkiewicz Artery (AKA). Test-bolus imaging methods have long been the mainstream, and recently, a time resolved technique (4D-MRA) is also reported. However, the current rates of detection for both are mixed, and the best method has not been established yet. For AKA, the present rate is 72% left, Th8～L1 91% that exists between, with a vessel diameter of 0.5 to 1.5 mm. Additionally, the AKA branch is known to have large individual differences, and thus, a wide range of high spatial resolution imaging. At our institution from January 2009, a 3 T system is installed, and 4D-MRA (time-resolved angiography with interleaved stochastic trajectories: TWIST) imaging became possible. TWIST is a sequence to balance the temporal resolution and spatial resolution, and is considered optimal for the imaging of AKA. In accordance with this idea, the first group of seven patients was imaged by TWIST, but in all cases, the results were not depicting AKA. In subsequent cases, the technique was changed to a 3D-gradient echo sequence with a Bolus-tracking method (Care bolus), and good results were obtained. In conclusion, AKA TWIST was not thought to depict the relationship between specific parameters. When using TWIST for imaging AKA, we will need to find out why it was not visualized, by examining AKA with simulated vessel phantoms, TWIST and Care Bolus. Furthermore, we report on our visual evaluation of the Retrospective clinical pictures.
    抄録全体を表示
    PDF形式でダウンロード (729K)
  • SPECTの投影数が再構成画像に及ぼす影響－シミュレーションデータを用いたFBP法とML-EM法の比較－
    藤原 秀司, 陰山 真吾, 磯田 康範, 長木 昭男, 松友 紀和, 高畑 明, 古味 省宏, 大西 英雄
    2010 年 66 巻 12 号 p. 1587-1597
    発行日: 2010/12/20
    公開日: 2011/01/26
    DOIhttps://doi.org/10.6009/jjrt.66.1587
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    Purpose: The influence of the numbers of projection of SPECT exerting on a re-constructed image cannot be strictly evaluated by phantom studies. Therefore, we compared re-constructed images of the FBP method and the ML-EM method by using simulation data. Methods: Simulation data was entered in the image processing software, and the projection data that changed the numbers of projection was made. Afterwards, reconstructed images of the FBP and the ML-EM methods were compared with respect to contrast, %COV, and the NMSE value. Result: When the numbers of projection of the FBP and the ML-EM method were decreased, all of the contrast, %COV, and the NMSE value were more deteriorated than that of the ideal image. Therefore, the image quality of SPECT improves with both FBP and ML-EM methods when there are many numbers of projection. Moreover, the FBP method was excellent in a cold contrast, and the ML-EM method was uniformly excellent. Therefore, an understanding of features and their inspection are effective for the selection of each image reconstruction method.
    抄録全体を表示
    PDF形式でダウンロード (1025K)
  • Balanced Turbo Field Echoを用いた骨盤腔静脈叢描出のための至適撮像条件の検討
    高津 安男, 小山 貴
    2010 年 66 巻 12 号 p. 1598-1606
    発行日: 2010/12/20
    公開日: 2011/01/26
    DOIhttps://doi.org/10.6009/jjrt.66.1598
    ジャーナル フリー
    抄録を表示する抄録を非表示にする
    Evaluating the relation between the developing range and the extent of invasion of a malignant tumor around the pelvic venous plexus is an important index for making strategic therapeutic decisions. In this study, we tried to depict a venous plexus in the pelvis using Balanced Turbo Field Echo (B-TFE). At first, we used an original phantom (derived from one layer of lard and another of agar (0.1%Gd-DTPA, 0.9%NaCl), each 500 ml, and we changed the Start Up Echo (SUE); 0-30, SPAIR inversion delay time (delay time); 0-200 ms, shot interval (SI); 1150, 1500 ms and evaluated the degree of fat suppression in SNR, CNR (the air signal method). The fat suppression-effect was found to be high in delay time; 120 ms in SUE; 0, SI; 1150 ms and 160 ms in SUE; 0, SI; 1500 ms was different SUE>0 each delay time. As for the images of healthy volunteers (5 men and 5 women), after fixing optimum conditions, we evaluated the images visually, as assessed by two radiologists and two radiographers, comparing between SUE; 0-30 and SI; 1150 and 1500 ms. According to the visual evaluation, the fat suppression-effect was worse, more than with the delay time; 20. We judged the best image of the venous plexus in the pelvis as being at SUE; 10, SI; 1500 ms. We think that using the B-TFE can help distinguish pelvic venous plexuses, by setting an optimum sequence.
    抄録全体を表示
    PDF形式でダウンロード (836K)
特別企画　名誉会員インタビュー
第65回総会学術大会　技術活用セミナー
第36回秋季学術大会　ランチョンセミナー
教育講座－画像解析の基礎－
教育講座－研究方法論－
基礎講座－パソコンソフト活用術－
臨床技術講座
学術交流委員会だより
学術調査研究班報告
JIRAトピックス
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top