Clinical Evaluation of Synthetic Aperture Harmonic Imaging for Scanning Focal Malignant Liver Lesions

Brandt, Andreas Hjelm; Hemmsen, Martin Christian; Hansen, P.; Madsen, Signe Sloth; Krohn, Paul Suno; Lange, Theis; Hansen, Kristoffer Lindskov; Jensen, Jørgen Arendt; Nielsen, Michael Bachmann

doi:10.1016/j.ultrasmedbio.2015.05.008

Cited by 4 publications

(8 citation statements)

References 40 publications

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“…The proposed assessment methodology is based on earlier publications of studies of clinical evaluation between pairs of sequences [24]- [26] and suggested testing procedures according to recommendation 500 from ITU-R [27] for subjective quality assessment. The proposed methodology describes two assessment situations, one for the assessment of diagnosticaccuracy and one for diagnostic-thinking.…”

Section: Assessment Methodologymentioning

confidence: 99%

“…15 seconds on average per image sequence. The details of the study and the statistical analysis is presented in [26].…”

Section: Phase IIImentioning

confidence: 99%

“…The ROC assessment was not conducted in [26], but the same data has been used by one medical doctor (AHB) to perform the assessment as an example, and the result is shown in Fig. 10.…”

Section: Phase IIImentioning

confidence: 99%

“…The purpose of this paper is to disseminate best practices in relation to the assessment of image quality for new ultrasound imaging methods based on our experience of such assessment in a number of studies [24]- [26]. We have here been confronted by the many choices in making a fair comparison and ensure a statistically valid result.…”

Section: Introductionmentioning

confidence: 99%

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A Methodology for Anatomic Ultrasound Image Diagnostic Quality Assessment

Hemmsen

Lange

Brandt

et al. 2017

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Abstract-This paper discusses methods for assessment of ultrasound image quality based on our experiences with evaluating new methods for anatomic imaging. It presents a methodology to ensure a fair assessment between competing imaging methods using clinically relevant evaluations. The methodology is valuable in the continuing process of method optimization and guided development of new imaging methods. It includes a three phased study plan covering from initial prototype development to clinical assessment. Recommendations to the clinical assessment protocol, software, and statistical analysis are presented. Earlier uses of the methodology has shown that it ensures validity of the assessment, as it separates the influences between developer, investigator, and assessor once a research protocol has been established. This separation reduces confounding influences on the result from the developer to properly reveal the clinical value. The paper exemplifies the methodology using recent studies of Synthetic Aperture Sequential Beamforming tissue harmonic imaging.

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Section: Assessment Methodologymentioning

confidence: 99%

“…15 seconds on average per image sequence. The details of the study and the statistical analysis is presented in [26].…”

Section: Phase IIImentioning

confidence: 99%

“…The ROC assessment was not conducted in [26], but the same data has been used by one medical doctor (AHB) to perform the assessment as an example, and the result is shown in Fig. 10.…”

Section: Phase IIImentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Methodology for Anatomic Ultrasound Image Diagnostic Quality Assessment

Hemmsen

Lange

Brandt

et al. 2017

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…Therefore, SAI allows for higher resolution and interpretability throughout the entire image, rather than only at prespecified foci. SAI has shown superior image quality in breast, 25 liver, 26 abdominal US imaging 27 due to increased resolution.…”

Section: Synthetic Aperture Imagingmentioning

confidence: 99%

Effects of line fiducial parameters and beamforming on ultrasound calibration

et al. 2017

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Abstract. Ultrasound (US)-guided interventions are often enhanced via integration with an augmented reality environment, a necessary component of which is US calibration. Calibration requires the segmentation of fiducials, i.e., a phantom, in US images. Fiducial localization error (FLE) can decrease US calibration accuracy, which fundamentally affects the total accuracy of the interventional guidance system. Here, we investigate the effects of US image reconstruction techniques as well as phantom material and geometry on US calibration. It was shown that the FLE was reduced by 29% with synthetic transmit aperture imaging compared with conventional B-mode imaging in a Z-bar calibration, resulting in a 10% reduction of calibration error. In addition, an evaluation of a variety of calibration phantoms with different geometrical and material properties was performed. The phantoms included braided wire, plastic straws, and polyvinyl alcohol cryogel tubes with different diameters. It was shown that these properties have a significant effect on calibration error, which is a variable based on US beamforming techniques. These results would have important implications for calibration procedures and their feasibility in the context of image-guided procedures.

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Ultrasound Vector Flow Imaging—Part II: Parallel Systems

Jensen

Nikolov

et al. 2016

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

100

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Abstract-The paper gives a review of the current state-of-theart in ultrasound parallel acquisition systems for flow imaging using spherical and plane waves emissions. The imaging methods are explained along with the advantages of using these very fast and sensitive velocity estimators. These experimental systems are capable of acquiring thousands of images per second for fast moving flow as well as yielding estimates of low velocity flow. These emerging techniques allow vector flow systems to assess highly complex flow with transitory vortices and moving tissue, and they can also be used in functional ultrasound imaging for studying brain function in animals. The paper explains the underlying acquisition and estimation methods for fast 2-D and 3-D velocity imaging and gives a number of examples. Future challenges and the potentials of parallel acquisition systems for flow imaging are also discussed.

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Clinical Evaluation of Synthetic Aperture Harmonic Imaging for Scanning Focal Malignant Liver Lesions

Cited by 4 publications

References 40 publications

A Methodology for Anatomic Ultrasound Image Diagnostic Quality Assessment

A Methodology for Anatomic Ultrasound Image Diagnostic Quality Assessment

Effects of line fiducial parameters and beamforming on ultrasound calibration

Ultrasound Vector Flow Imaging—Part II: Parallel Systems

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