Virtual Monochromatic Spectral Imaging with Fast Kilovoltage Switching: Improved Image Quality as Compared with That Obtained with Conventional 120-kVp CT

Matsumoto, Kazuhiro; Jinzaki, Masahiro; Tanami, Yutaka; Ueno, Akihisa; Yamada, Minoru; Kuribayashi, Sachio

doi:10.1148/radiol.11100978

Cited by 421 publications

(266 citation statements)

References 15 publications

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“…They concluded that 70-keV virtual monoE images had lower noise and higher CNR in comparison to conventional 120-kVp images [15]. Although they used phantoms and our study is a prospective study on patients, our results are consistent.…”

Section: Discussionsupporting

confidence: 82%

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Assessment of 70-keV virtual monoenergetic spectral images in abdominal CT imaging: A comparison study to conventional polychromatic 120-kVp images

et al. 2017

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Section: Discussionsupporting

confidence: 82%

“…Matsumoto et al compared the image quality of virtual monoE images from fast kilovoltage switching to conventional 120-kVp in phantoms [15]. They concluded that 70-keV virtual monoE images had lower noise and higher CNR in comparison to conventional 120-kVp images [15].…”

Section: Discussionmentioning

confidence: 99%

Assessment of 70-keV virtual monoenergetic spectral images in abdominal CT imaging: A comparison study to conventional polychromatic 120-kVp images

et al. 2017

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“…Because CNR is calculated as contrast divided by image noise, the low image noise of the monochromatic images may be another factor that contributes to the higher CNR. Previous studies have also shown that the image noise on monochromatic images was lowest at approximately 70 keV within the range 40-140 keV [13] and lower than that of conventional 120 kVp CT [10]. This indicates that the monochromatic mode can yield higher quality images than the polychromatic mode, not only from increasing contrast but also from decreasing noise.…”

Section: Discussionmentioning

confidence: 81%

“…The reconstruction thickness was 5 mm, at intervals of 5 mm. The data acquired in the spectral CT imaging mode were used to produce one set of conventional polychromatic images and one set of monochromatic images (70 keV) [10]. The polychromatic images were reconstructed using a standard CT reconstruction algorithm.…”

Section: Imaging Techniquementioning

confidence: 99%

Which should be the routine cross-sectional reconstruction mode in spectral CT imaging: monochromatic or polychromatic?

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Sy²,

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et al. 2012

BJR

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Objective: To provide evidence for the selection of an optimal cross-sectional reconstruction mode in spectral CT imaging of the abdomen, we compared the monochromatic images with polychromatic images. Methods: Three phase-enhanced CT scans of the abdomen were recorded using the spectral imaging technique on 100 patients. Images were reconstructed using two modes: polychromatic and 70 keV monochromatic. The following variables were then compared: contrast-to-noise ratio (CNR) of the liver, spleen, gallbladder, kidney and pancreas, and the noise. Paired t-tests were used to compare differences between the two sets of images. Three experienced doctors graded the quality of the images with a five-point scale. The image quality scores were compared with a non-parametric rank sum test. Results: Compared with polychromatic images, the 70 keV monochromatic mode images yielded significantly greater tissue-to-fat CNR and lower noise (p,0.001 for all comparisons). The image quality of the 70 keV monochromatic mode showed significantly better results than the polychromatic mode (p,0.001). Conclusions: In abdominal spectral CT imaging, 70 keV monochromatic mode reconstruction images were better than those reconstructed using the polychromatic mode. The monochromatic mode may become the routine reconstruction mode for cross-sectional images. Recently, the advancement of CT technology, such as dual-source technology or fast peak kilovoltage switching technology, has enabled the routine clinical application of dual-energy spectral CT for the abdomen [4]. The results of preliminary investigations suggest that dual-energy techniques may be used to provide information about tissue composition and how tissues behave at different energies in the abdomen [5][6][7][8][9]. New parameters, such as the iodine concentration and the spectral curve, can be acquired using spectral CT. However, because the ability of spectral CT to characterise lesions is still uncertain, no diagnosis is possible, only reference to the pattern of spectral curves or other spectral CT parameters. Therefore the morphological characteristics and enhancement features of lesions in cross-sectional images still remain the basis of diagnosis of abdominal spectral CT images. In addition, the reconstruction of cross-sectional images remains a routine procedure for spectral CT imaging of the abdomen. In the present spectral CT system based on fast peak kilovoltage switching technology, there are two cross-sectional image reconstruction modes available: monochromatic and polychromatic modes. To our knowledge, there has not been a study designed to demonstrate which routine reconstruction mode should be used after spectral CT imaging. To answer this question, our study seeks to compare the quality of CT images of the abdomen reconstructed in monochromatic mode with those from a polychromatic mode, and therefore provide evidence for the selection of the optimal reconstruction mode.

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“…Virtual monochromatic images (VMI) (65) are obtained applying attenuation measurements in two basic materials such as iodine and water, which are transformed into densities obtained from low and high voltage peak projections and then rebuilt to originate the base material image pairs. Monochromatic examination allows the visualization of the tissues at different energy levels ranging from 40 to 140 keV (Siemens and GE) and up to 200 keV (Philips).…”

Section: Monochromatic Examinationmentioning

confidence: 99%

Myocardial CT perfusion imaging for ischemia detection

Carrascosa

Capuñay

2017

Cardiovasc. Diagn. Ther.

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Virtual Monochromatic Spectral Imaging with Fast Kilovoltage Switching: Improved Image Quality as Compared with That Obtained with Conventional 120-kVp CT

Cited by 421 publications

References 15 publications

Assessment of 70-keV virtual monoenergetic spectral images in abdominal CT imaging: A comparison study to conventional polychromatic 120-kVp images

Assessment of 70-keV virtual monoenergetic spectral images in abdominal CT imaging: A comparison study to conventional polychromatic 120-kVp images

Which should be the routine cross-sectional reconstruction mode in spectral CT imaging: monochromatic or polychromatic?

Myocardial CT perfusion imaging for ischemia detection

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