Medical Imaging and Information Sciences

The principle and clinical application of Tomosynthesis

Takeshi SHIOMI

2007 Volume 24 Issue 2 Pages 22-27
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.22

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The Flat Panel Detector(FPD)and digital imaging technologies have widely utilized in various clinical application with R/F diagnostic table system. Tomosynthesis is the digital imaging technique which reconstructs the tomography images of any height with one-time tomographic application. This report refers to the principle of Tomosysthesis and its clinical application with the Shimadzu Sonialvision safire digitalized X-ray diagnostic table system.

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[title in Japanese]

[in Japanese]

2007 Volume 24 Issue 2 Pages 28-29
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.28

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Development of dual source computed tomography

Toshihide ITOH, Katharina OTANI

2007 Volume 24 Issue 2 Pages 30-34
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.30

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To capture an image of the entire heart without any motion artifacts has been for a long time the motivation to develop advanced clinical X-ray computed tomography. Towards this aim, we invented the novel concept of computer tomography performed with two X-ray tubes and corresponding two X-ray detectors - dual-source computer tomography (DSCT). The major benefit of DSCT is its improved temporal resolution(83ms)independent of a patient's heart rate. DSCT offers further advantages: The dose to the patient during a cardiac DSCT examination can be significantly reduced (about 50%) compared to the dose during an examination with conventional single X-ray tube CT. DSCT also makes a novel imaging application possible: Dual energy imaging with different kV settings for each X-ray tube. With dual energy CT, anatomical images that include characteristic information on body tissues can be obtained. We believe that dual source and dual energy imaging have the potential to open a new era of X-ray CT diagnosis.

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Present and future of Philips CT

Hirokazu OSAKABE, Mehta Dhruv, Teruki IGUCHI

2007 Volume 24 Issue 2 Pages 35-38
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.35

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Philips has been started MDCT business since 2001. In the past several years, Philips has continued to grow, to become a global leader in diagnostic imaging systems. While it had consistently seen growth, it took major leaps in Computed Tomography solutions with the acquisitions of leading medical imaging companies in 2001. Philips present model CT, Brilliance CT, has our most innovative technologies which are MRC Tube, Auto Tracking ROI on Bolus Tracking, and Skull Removal for bone remove at head and neck field on Brilliance console. Its current multislice CT systems under the brand name Brilliance^TM integrate innovative technologies such as the MRC Tube, Auto Tracking ROI for Bolus Tracking and Bone Removal for head and neck CTA's. On Philips workstation(Extended Workspace), Filet view on virtual colonoscopy and comprehensive cardiac analysis are introduced at this paper. This paper outlines the history of Philips CT and its associated cutting edge technologies. It also, introduces some of the key applications such as virtual colonoscopy and comprehensive cardiac analysis.

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Features of Aquilion^TM 64 multi slice CT

— Clinical supporting technologies and applications —

Kazuhiro ANAMI

2007 Volume 24 Issue 2 Pages 39-45
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.39

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The recent introduction of multislice CT systems capable of 64-row simultaneous acquisition has made it possible to obtain high-precision images over an extensive range in a short time. This technology is attracting attention in a variety of clinical fields. A number of clinical advantages have been discussed in the areas of the brain, neck, chest, large vessels, and abdomen, including shorter breathholding times, reduced contrast volumes, multiphase imaging capabilities, and improved throughput. In addition, in cardiac CT studies, which are currently in the spotlight as a new noninvasive imaging technique, improved examination efficiency, higher success rates, and the possibility of replacing invasive methods have been reported. We would like to introduce the 64-row Aquilion multislice CT system with the world's thinnest slice thickness of 0.5mm. This system has a variety of clinical advantages and moves us forward into the era of area-detector CT.

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SnapShot Pulse, a new cardiac imaging method for 64 detector rows CT

Koichi NAKANO

2007 Volume 24 Issue 2 Pages 46-49
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.46

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Since the introduction of Multi Detector Row CT(MDCT)in 1998, technology in cardiac imaging has advanced continuously up to today. Clinical utility of Cardiac CT was first recognized with 16ch MDCT introduced in 2001, and with the emergence of 64ch MDCT in 2004, the clinical utility seems to be well established. In just 6 years, Cardiac CT has gone through series of technology advancement from scanning to image processing in a very short period of time. Today, the speed of technology evolution shows no sign of slowing down. SnapShot Pulse is a new technology in cardiac scan that can reduce X-ray dose so inherent with conventional retrospective gating helical scan technology. SnapShot Pulse is step-&-shoot scanning technology with prospective gating and can reduce X-ray dose up to 87.5%.

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Study of the three-dimensional image display method varied signal value in coronary arteries CT

Masakatsu HOASHI, Shogo AZEMOTO, Yusuke IMASUGI, Yasuhiro KAWANO, Hiro ...

2007 Volume 24 Issue 2 Pages 50-54
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.50

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Measures technology to the problem of diagnosis workflow by the Aquarius solution

Satoshi SHIMIZU, Junichi SUGITA, Andjela AZABAGIC, Robert TAYLOR

2007 Volume 24 Issue 2 Pages 55-60
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.55

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The evolution of a Modarity represented by MSCT brings the explosion of the quantity of inspection data. It is easy to treat these large data intuitively interactively quickly, and the system which a technologist and a doctor can treat is bought. However, there is a limit in conventional PACS system and WS, and expensive H/W to realize transfer time and the high handling of data set is necessary in large quantities. We think, the solution which is cheap, and can use these volume data browsing feature while all doctors have 3D performance same as a work station with every computer being an ideal solution. Furthermore, we developed a new backbone platform called Aquarius iNtuition to solve a problem in the workflow.

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Development and evolution of Ziostation

Isao TAMAI

2007 Volume 24 Issue 2 Pages 61-66
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.61

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The development of Medical Technology in recent years is remarkable. The composition in a target blood vessel is displayed in the color map and it is designed to be useful for the diagnosis, and the necessity for helping a clear diagnosis in a short time is actually felt because of the development phase and what promptly made achievement is present Ziostation. This time, I want to describe the problem and the development of use and the current state of our company WS(Ziostation).

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Evaluation of endometrial and uterine cervical cancer's fat using MDCT data

Masanori SATO, Toshihiro OGURA, Takashi TAKAGI, Noriko IDA

2007 Volume 24 Issue 2 Pages 67-71
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.67

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To assess the relationships between intra-abdominal fat and uterine cervical and endometrial cancer, intra-abdominal fat distribution was investigated in 39 cases of endometrial cancer and 23 cases of uterine cervical cancer using X-ray CT data. The results showed that the mean intra-abdominal fat area in the region -5cm to +5cm from the navel was significantly higher for endometrial cancer than for uterine cervical cancer. These results confirm that patients with endometrial cancer tend to have accumulation of visceral fat. In a similar study, Ogura showed that 62.6%(n=139)of Japanese patients with rectal cancer had a small secondary peak in the pelvis, named Ogura's peak, on the profile of intra-abdominal fat distribution. In comparison, only about 10% of patients with uterine cancer including cervical and endometrial cancer had this sub-peak on their profile. The results clarified that the intra-abdominal fat distribution for uterine cervical and endometrial cancer patients differ from that for rectal cancer patients, suggesting that intra-abdominal fat distribution may be useful in detecting uterine cervical and endometrial cancers.

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Assessment of intra-abdominal fat in patients with prostate cancer using X-ray computed tomography images

Toshihiro OGURA, Hitoshi IGARASHI, Younosuke SHIMOMURA, Kunihiro HIRAN ...

2007 Volume 24 Issue 2 Pages 72-78
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.72

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To assess relationships between intra-abdominal fat and prostate cancer, intra-abdominal fat distribution was investigated of prostate cancer of 75 examples and various cases of 508 examples with X-ray CT data. On the other hand, in Japanese, visceral fat obesity indicating intra-abdominal fat area at the navel was ≥100cm². The results showed that 81.3%(n=75)of prostate cancer exhibits visceral fat obesity. A significant finding was that intraabdominal fat area steeply decreased near the pubic symphysis in prostate cancer. This unique pattern was seen in 90.7%(n=75)of prostate cancer patients, markedly higher than in patients with gastric(12.2%, n=49)or colon cancer(36.0%, n=314)and other cancers except for prostate cancer(34.1%, n=508).The relationship between fat and prostate cancer is hard to explain, but some relationship appears to exist between prostate cancer and intra-abdominal fat distribution. To make use of these results for intra-abdominal fat distribution, a computer-aided diagnosis(CAD)system for detecting prostate cancer according to the presence of a unique pattern offers potential as a method for detection of prostate cancer or warning of affection.

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Investigation on pericardiac fat distribution using multi-detector row CT scan data

Toshihiro OGURA, Kunihiro HIRANO, Younosuke SHIMOMURA, Hitoshi IGARASH ...

2007 Volume 24 Issue 2 Pages 79-83
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.79

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Pericardiac fat distribution was investigated of 246 examples using multi detector row X-ray CT data. Subjects comprised 184 men and 62 women who underwent CT of the heart region during ECG gate. Mean age of subjects were 56.9±10.6 years(male) and 60.9±8.4 years (female). Much pericardiac fat stuck to right side of the heart more than 90% with man and woman. We classified pericardiac fat distribution to stick around a heart in eight patterns, such as stick a lot to upper part of heart, stick a lot to lower part of heart, stick a lot to both upper and the lower part of heart and stick to whole of the heart surface thinly and others. In consequence of this classification, one significant finding was seen that the appearance frequency of pericardiac fat distribution patterns almost accorded between men and women.

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Computerized detection of aneurysms in MRA images based on gradient concentration filter

Jun OGURA, Yoshikazu UCHIYAMA, Masashi YAMAUCHI, Ryujiro YOKOYAMA, Tak ...

2007 Volume 24 Issue 2 Pages 84-89
Published: August 01, 2007
Released on J-STAGE: November 27, 2007

DOIhttps://doi.org/10.11318/mii.24.84

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The detection of unruptured aneurysms is major subject in magnetic resonance angiography(MRA). However accurate detection of aneurysms is difficult because of the overlap between the aneurysms and the adjacent vessels on maximum intensity projection images. Therefore, the purpose of this study was to develop a computer-aided diagnosis (CAD)scheme for the detection of unruptured aneurysms. First, we segmented the vessels regions using gray-level thresholding and region growing techniques. The gradient concentration(GC)filter was then applied to the segmented vessel regions for the enhancement of aneurysms. The initial candidates were determined in the GC image with a gray-level threshold. For removal of false positives(FPs), we determined 4 features, i.e., volume, sphericity, mean value of GC image, and maximum value of GC image. The rule-based schemes and a quadratic discriminant analysis with 4 features were employed for distinguishing aneurysms and FPs. The sensitivity for detection of aneurysms was 93.8%(15/16)with 4.06 FPs per patient. Our CAD scheme will be useful in assisting radiologists and/or neurosurgeons for identifying aneurysms in MRA images.

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