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This paper presents a comparison study between 10 automatic and six interactive methods for liver segmentation from contrast-enhanced CT images. It is based on results from the "MICCAI 2007 Grand Challenge" workshop, where 16 teams evaluated their algorithms on a common database. A collection of 20 clinical images with reference segmentations was provided(More)
Low back pain is a common problem in rowers of all levels. Few studies have looked at the relationship between rowing technique, the forces generated during the rowing stroke and the kinematics of spinal motion. Of particular concern with respect to spinal injury and damage are the effects of fatigue during long rowing sessions. A technique has been(More)
Continuous recording of intra-arterial blood pressure and electrocardiograms has been performed in 41 ambulant untreated essential hypertensive subjects for periods up to 48 hours. Statistical analysis of the results has revealed: (1) A group of patients who developed a persistent tachycardia during the day. This response was not observed in a control(More)
Using the "Oxford system" for ambulatory monitoring of direct arterial blood pressure (BP), the hypotensive effect of enalapril (20 to 40 mg/day), was assessed in 15 patients with essential hypertension. BP was reduced by enalapril throughout the 24 hours of study. A within-patient comparison of corresponding mean hourly systolic and diastolic BP values(More)
Indirect blood pressures recorded with a random zero sphygmomanometer were compared with simultaneous intra-arterial blood pressures recorded with the Oxford system. Twenty five patients undertook a graded bicycle exercise test, cycling at workloads increasing from 41, 65, 114, and 163 W (250 to 400, 700, and 1000 kpm per min) with each grade being(More)
1. We have assessed the day-to-day reproducibility of intra-arterial blood pressure by monitoring 17 freely ambulant hypertensive patients for a period of 48 h. Eight had no change of therapeutic regimen throughout and nine took a single dose of a hypotensive agent before retiring on the second night. 2. Records were analysed to provide hourly mean values(More)
The relation between heart rate and ischemic ST-segment depression was studied in 70 patients with documented obstructive coronary artery disease (CAD) and reproducible effort angina. Symptom-limited treadmill exercise testing was performed before and after a 2-week placebo period and 24-hour FM ambulatory electrocardiographic monitoring at the end of the(More)
Self-recording of the blood pressure by patients away from hospital or office ("home blood pressure") has been advocated as providing a better estimate of "true" blood pressure. The reliability of home blood-pressure recording has been assessed only by standard indirect methods which themselves are subject to considerable error and variability. The accuracy(More)
  • P M Cashman
  • 1977
A data reduction technique is presented which enables the patterns of cardiac rhythm inherent in a long-term ECG recording to be described in a concise fashion. The method consists in combining an R-R interval difference histogram, which gives information about the detailed structure of cardiac rhythm patterns, with an R-R interval histogram, which(More)
Fast analysis of long-term intra-arterial blood-pressure recordings can be approached in various ways. We describe a low cost system, consisting of a hybrid preprocessor and a minicomputer, which can either perform fast data reduction, producing simple statistical information to aid patient management, or be used as the basis of a more comprehensive signal(More)