The Effects of Irreversible JPEG Compression on an Automated Algorithm for Measuring Carotid Artery Intima-Media Thickness from Ultrasound Images

Nj, Hangiandreou; Em, James; Rd, McBane; Dj, Tradup; Kr, Persons

doi:10.1007/s10278-002-5022-0

Cited by 12 publications

(8 citation statements)

References 2 publications

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“…JPEG images provide comparable accuracy for ultrasound image measurements compared to the DICOM (Digital Imaging and Communications in Medicine) standard. 28 Images were analyzed offline using semi-automated edge-detection software custom written to interface with National Instruments Lab view software (see Figure 1). Reported resting diameters represent the average from 1 min of rest.…”

Section: Arterial Health Protocolsmentioning

confidence: 99%

Electrical stimulation-evoked resistance exercise therapy improves arterial health after chronic spinal cord injury

et al. 2006

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Study design: Repeated measures training intervention. Objectives: To evaluate the effects of neuromuscular electrical stimulation (NMES)-induced resistance exercise therapy on lower extremity arterial health in individuals with chronic, complete spinal cord injury (SCI). We define 'arterial health' using three surrogate markers: (a) resting diameter, (b) flow-mediated dilation (FMD), and (c) arterial range. Setting: Department of Kinesiology, University of Georgia, USA. Methods: We assessed five 3675-year-old male individuals with chronic, complete SCI before, during, and after 18 weeks of training. The quadriceps femoris muscle group of both legs were trained twice a week with 4 Â 10 repetitions of unilateral, dynamic knee extensions. The health of the posterior tibial artery was assessed using a B-mode ultrasound unit equipped with a highresolution video capture device. Proximal occlusion was used to evoke ischemia for 5 min and then for 10 min. FMD was calculated using the peak diameter change (above rest) following 5 min occlusion. Arterial range was calculated using minimum (during occlusion) and maximum diameters (post 10 min occlusion). Hierarchical linear modeling accounted for the nested (repeated measures) experimental design. Results: FMD improved from 0.0870.11 mm (2.7%) to 0.1870.15 mm (6.6%) (P ¼ 0.004), and arterial range improved from 0.3670.28 to 0.9470.40 mm (P ¼ 0.001), after 18 weeks of training. Resting diameter did not significantly change. Conclusions: Home-based, self-administered NMES resistance exercise therapy consisting of 80 contractions/week improved FMD and arterial range. This provides evidence that resistance exercise therapy can improve arterial health after SCI, which may reduce the risk of future cardiovascular disease.

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Section: Arterial Health Protocolsmentioning

confidence: 99%

Electrical stimulation-evoked resistance exercise therapy improves arterial health after chronic spinal cord injury

et al. 2006

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“…Video files collected at 30 frames ·s and were converted into JEPG images and subsequently used to make 30 diameter measurements ·s. The JPEG images provide comparable accuracy for ultrasound image measurements compared to the Digital Image and Communications in Medicine standard (Hangiandreou, James, McBane, Tradup, & Persons, 2002). Three 10s movies were taken for each stage of testing.…”

Section: Diameter Measurementsmentioning

confidence: 99%

Forearm oxygenation and blood flow kinetics during a sustained contraction in multiple ability groups of rock climbers

Fryer¹,

Stoner

Scarrott

et al. 2014

Journal of Sports Sciences

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DisclaimerThe University of Gloucestershire has obtained warranties from all depositors as to their title in the material deposited and as to their right to deposit such material.The University of Gloucestershire makes no representation or warranties of commercial utility, title, or fitness for a particular purpose or any other warranty, express or implied in respect of any material deposited.The University of Gloucestershire makes no representation that the use of the materials will not infringe any patent, copyright, trademark or other property or proprietary rights.The University of Gloucestershire accepts no liability for any infringement of intellectual property rights in any material deposited but will remove such material from public view pending investigation in the event of an allegation of any such infringement. O2%·s-1 respectively). Furthermore, elite climbers de-oxygenated the flexor carpi radialis significantly (p< 0.05) more, and at a greater rate than the intermediate group (36.5 vs. 14.6%O2 and 0.43 vs. 0.1O2%·s -1 respectively). However, there were no significant differences in total forearm ∆ blood flow. An increased MVC/N is not associated with greater blood flow occlusion in elite climbers therefore, oxidative capacity may be more important for governing performance.

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“…Video files collected at 30 frames/second were converted into loss‐less Joint Photographic Experts Group (JPEG) images and subsequently used to make 30 diameter measurements/second. JPEG images provide similar accuracy for ultrasound image measurements compared with the digital image and communications in medicine standard 17. Diameters were measured continuously during the transient conditions.…”

Section: Methodsmentioning

confidence: 99%

Peak and time‐integrated shear rates independently predict flow‐mediated dilation

Stoner

McCully

2012

J of Clinical Ultrasound

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Background:To determine whether peak and time‐integrated shear rates independently predict flow‐mediated dilation (FMD).Methods:Eleven physically active (25±5 years old) male subjects were tested. FMD was defined as the shear rate‐diameter relationship. Hierarchical linear modeling was used to estimate brachial artery diameter change with repeated measures of shear rate nested within each subject. Two models were tested: 1) FMD was induced using ischemia‐induced hyperemia (2, 4, 6, and 10 minutes); and 2) FMD was induced following transient (ischemia) and steady‐state (forearm heating and handgrip exercise) increases in shear rate. For both models we determined whether peak, in addition to time‐integrated shear rates, explained a significant portion of variation for diameter change.Results:Model 1: Time integrated shear rates explained most of the variation for diameter change. However, peak shear rate explained an additional significant portion of variation. Model 2: The transient condition resulted in significantly (p = 0.012) smaller diameter change per shear rate change than the steady‐state condition. However, when specifying peak shear rate as a covariate, the difference between conditions became nonsignificant (p = 0.138).Conclusions:Peak and time‐integrated shear rates independently predict FMD. Future studies using the FMD test should consider both parameters. © 2012 Wiley Periodicals, Inc. J Clin Ultrasound, 2012;

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The Effects of Irreversible JPEG Compression on an Automated Algorithm for Measuring Carotid Artery Intima-Media Thickness from Ultrasound Images

Cited by 12 publications

References 2 publications

Electrical stimulation-evoked resistance exercise therapy improves arterial health after chronic spinal cord injury

Electrical stimulation-evoked resistance exercise therapy improves arterial health after chronic spinal cord injury

Forearm oxygenation and blood flow kinetics during a sustained contraction in multiple ability groups of rock climbers

Peak and time‐integrated shear rates independently predict flow‐mediated dilation

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