文献一覧: 公益社団法人日本放射線技術学会 (出版者)

It is a fact that image noise influences for image qualities of the brain CT are known widely. The same principle applies to 3D-CTA, image noise significantly influences the depiction of blood vessels. So we evaluated the use of CT-AEC for 3D-CTA to optimize the scan dose and control the depiction of cerebral vessels by CT-AEC. We decided to optimize the noise index (NI) for cerebral 3D-CTA through the use of an imitation blood phantom. In the evaluation of the depiction of the anterior choroidal artery that was able to be confirmed with DSA, the detection rate in high resolution mode: NI 6.0 was 70%. The depiction of the anterior choroidal artery became defective in the detailed exam mode: NI 7.0, low dose mode: NI 9.0 because of the noise. As for the existence of cerebral aneurysms, the sensitivities were 100% with DSA and 94.3% with 3D-CTA in detailed exam mode, and there was no statistical difference. The specificities of 3D-CTA had lowered to 92.6% and 97.2% in DSA. In low dose mode and detailed exam mode, DLP had decreased by 55.2% and 18.1% on the average compared to a fixed tube current (P<0.05). However, in high resolution mode, DLP increased by 5.9% on the average. It was necessary to limit the scan range to the region of interest when we used a fixed tube current. This clinical research verified that CT-AEC on cerebral 3D-CTA was useful for dose reduction and control of the depiction ability for inspection purposes.

2017-05-25 11:10:47
1 + 0 Twitter

1 0 0 0 OA 模擬血管ファントムを用いた心臓CTにおける逐次近似画像再構成法の血管描出能の検討

著者: 井上健市川勝弘原孝則瓜倉厚志星野貴志三浦洋平寺川彰一宇都文昭
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.68, no.12, pp.1631-1636, 2012-12-20 (Released:2012-12-20)
参考文献数: 12
被引用文献数: 3 1

Iterative reconstruction methods can reduce the noise of computed tomography (CT) images, which are expected to contribute to the reduction of patient dose CT examinations. The purpose of this study was to investigate impact of an iterative reconstruction method (iDose4, Philips Healthcare) on vessel visibility in coronary CT angiography (CTA) by using phantom studies. A simulated phantom was scanned by a CT system (iCT, Philips Healthcare), and the axial images were reconstructed by filtered back projection (FBP) and given a level of 1 to 7 (L1-L7) of the iterative reconstruction (IR). The vessel visibility was evaluated by a quantitative analysis using profiles across a 1.5-mm diameter simulated vessel as well as visual evaluation for multi planar reformation (MPR) images and volume rendering (VR) images in terms of the normalized-rank method with analysis of variance. The peak CT value of the profiles decreased with IR level and full width at half maximum of the profile also decreased with the IR level. For normalized-rank method, there was no statistical difference between FBP and L1 (20% dose reduction) for both MPR and VR images. The IR levels higher than L1 sacrificed the spatial resolution for the 1.5-mm simulated vessel, and their visual vessel visibilities were significantly inferior to that of the FBP.

2017-05-25 10:59:32
1 + 0 Twitter

1 0 0 0 185. 音響カプラを用い危乳癌の超音波像 : 超音波

著者: 渡辺善伸松原馨石井元洋堀洋児松浦重雄村上卓
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.43, no.8, 1987

2016-01-14 23:25:34
1 + 0 Twitter

1 0 0 0 OA 放射線技術分野への応用に向けたオントロジーの分類

著者: 福田晋久辻真太朗谷川原綾子西本尚樹小笠原克彦
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.71, no.6, pp.505-511, 2015 (Released:2015-06-20)
参考文献数: 31

This study aims to grasp the target area of the literature on ontology and to apply it in radiological technology. We used Google scholar to search the literature containing the keyword “ontology”. Our search identified and extracted 162,381 words from 29 manuscripts and used the 8,706 nouns excluding duplicates as individual variable. Using a cluster analysis, we categorized the documents to one of the following five classifications: (1) “Systematization of vocabulary by text mining”, (2) “Hierarchy of language information”, (3) “Conceptualization of situation”, (4) “Standardization of lexical information”, and (5) “Visualization of the concepts related to the problem”. We propose that the terminologies in (2), (4), and (5) cluster can be used in radiological technology field.

2015-08-29 15:31:29
1 + 0 Twitter

1 0 0 0 放射線業務の安全の質管理指針 3 団体合同プロジェクト班策定

著者: 天内廣太田原美郎山森和美泉孝吉佐藤幸光西村健司東村享治宮澤康志小口宏後藤太作藤本幸宏
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.63, no.5, pp.546-556, 2007-05-20 (Released:2007-05-31)
参考文献数: 21
被引用文献数: 5 3

2015-08-06 07:34:04
1 + 0 Twitter

1 0 0 0 OA 胃腫瘍性病変良悪性識別のためのコンピュータ支援診断システムの開発

著者: 長野宣道松尾孝美伊藤隆志友成健一朗白石順二
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.68, no.11, pp.1474-1485, 2012-11-20 (Released:2012-11-21)
参考文献数: 28

We proposed a method for a computer-aided diagnosis system that distinguishes between benign and malignant lesions in gastrointestinal digital radiography. To begin with, the level set method was applied in order to extract a tumor region from the image which was smoothed by the bilateral filter. Next, we selected four image features with the large SN ratio among various image features obtained from a tumor region using the Mahalanobis-Taguchi method, which has been employed mainly in quality engineering. The selected four image features—circularity, irregularity, size, and perimeter—were used as input data for the artificial neural network, which was employed for distinction between benign and malignant lesions. By using 43 regions of interest cropped from the 43 clinical cases, the area under the ROC curve (AUC) of diagnostic accuracy for the classification obtained with this proposed method was 0.970, whereas the average AUC obtained with 7 human observers (3 radiologists and 4 radiological technologist) was 0.941.

2013-12-23 20:43:40
1 Facebook

1 0 0 0 OA PET施設の医療従事者等の放射線防護の全国実態調査–第 1 報医療従事者等の職種,業務および被ばく線量–

著者: 渡辺浩佐藤努泉對則男木村文治佐野美也子星雅彦伊藤篤仲孝治佐川良
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.65, no.3, pp.285-294, 2009-03-20 (Released:2009-04-11)
参考文献数: 15
被引用文献数: 4 4

We have investigated the role assignment and radiation exposure of medical workers (including receptionists) in PET (positron emission tomography) facilities in Japan using a questionnaire. The survey period was from October 1st to November 15th 2006. The response rate for the questionnaire was 60.0% (72/120 facilities). Nurses were engaged in the intravenous administration of radioactive FDG in 66.9% of PET facilities. In 89.5% of PET facilities, radiological technologists mainly performed the PET examination. The average radiation exposure to medical workers was 0.13 mSv/month (n: 709, S.D.: 0.16) as the effective dose. It was shown that radiation exposure was significantly different depending on the occupation and content of work (p<0.01). The radiation exposure of cyclotron operators and radiological technologists was higher than that of the other occupations (p<0.01). The highest radiation dose to one worker per a PET facility was 0.60 [mSv month−1], which was 4.6 times higher than the average dose of 0.13 [mSv month−1]. We have clarified the actual conditions of radiation protection in PET facilities in Japan for the first time.

2013-06-27 10:55:14
1 + 0 Twitter

1 0 0 0 FDG-PET検査後に及ぼす患者からの放射線被曝 : 送迎専属運転手に対する被ばく対策(第63回総会学術大会放射線防護・管理関連後抄録)

著者: 菅野敏彦谷崎靖夫中村文俊
出版者: 公益社団法人日本放射線技術学会
雑誌: 放射線防護分科会会誌 (ISSN:13453246)
巻号頁・発行日: vol.25, 2007

2013-04-23 09:49:12
1 + 0 Twitter

1 0 0 0 放射線防護クリームの試作(第38回秋季学術大会放射線防護・管理関連演題発表後抄録)

著者: 大田和哲郎大谷浩樹川村友香下津加奈子脇坂純平
出版者: 公益社団法人日本放射線技術学会
雑誌: 放射線防護分科会会誌 (ISSN:13453246)
巻号頁・発行日: vol.32, 2011

2013-03-18 08:44:46
1 + 0 Twitter

1 0 0 0 ROC解析における観察者間および試料間変動を考慮した統計的有意差検定

著者: 白石順二
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.63, no.10, pp.1200-1207, 2007-10-20 (Released:2008-01-10)
参考文献数: 8
被引用文献数: 9 8

(抄録はありません)

2013-03-01 16:17:00
1 はてなブックマーク

1 0 0 0 OA MRI検査におけるインプラントと体内外金属物質の情報集約

著者: 小林昌樹小林正人染野竜也内山弘実小野祐樹
出版者: 公益社団法人日本放射線技術学会
雑誌: 日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日: vol.67, no.10, pp.1314-1319, 2011-10-20 (Released:2011-10-26)
参考文献数: 5
被引用文献数: 1

In Japan, various types of MRI equipment, having varying magnetic field strengths, are widely used. However, the biggest problem encountered while utilizing an MRI is the scarcity of information and guidelines pertaining to implants, internal, and external metallic objects. This leads to uncertainty when an unspecified object is encountered during an examination andcreates the possibility of performing an ambiguous MRI. Therefore, this study classified a range of objects into 12 categories using database management software. An attempt was made to create an environment where reference and comparison of products could be performed. This study also investigated the ways and extent to which medical equipment package inserts reference the MRI. With the co-operation of various corporations and the use of information such as medical equipment package inserts, product information was collected and an environment for the reference and comparison of products became available. In addition, it became apparent while examining these package inserts that orthopedic products had the least information available. It is likely that this information will be useful in medical settings and this kind of database will become increasingly necessary in the future.