Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics最新文献_第3页

Infrared emissivity of burn wounds. 烧伤创面的红外发射率。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-05-01 DOI: 10.1088/0143-0815/13/2/003

A Boylan, C J Martin, G G Gardner

引用次数: 24

Assessment of oxygen transfer in membrane oxygenators during clinical cardiopulmonary bypass. 临床体外循环中膜氧合器氧传递的评价。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-05-01 DOI: 10.1088/0143-0815/13/2/009

R H Clayton, D T Pearson, A Murray

{"title":"Assessment of oxygen transfer in membrane oxygenators during clinical cardiopulmonary bypass.","authors":"R H Clayton, D T Pearson, A Murray","doi":"10.1088/0143-0815/13/2/009","DOIUrl":"https://doi.org/10.1088/0143-0815/13/2/009","url":null,"abstract":"Although functional replacement of the heart and lungs by a pump and oxygenator is a widespread surgical procedure, no widely accepted technique for describing gas exchange in oxygenators exists. In this study, 8 types of commercially available membrane oxygenator (2 flat sheet membrane, 4 gas in hollow fibre membrane and 2 blood in hollow fibre membrane) have been studied during clinical cardiopulmonary bypass. O2 transfer increased with blood flow rate but the O2 transfer at a given blood flow was lower than that obtained by the manufacturers in laboratory studies. Overall O2 transfer coefficients were calculated from the ratio of O2 transfer rate to an O2 difference expressed either as an O2 partial pressure or an O2 concentration. Specific O2 transfer coefficients (overall coefficient divided by membrane area) were similar for oxygenators with a flat sheet or gas in hollow fibre membrane configuration. The two types of oxygenator with blood in hollow fibre membranes had significantly lower (P less than 0.01) specific O2 transfer coefficients. This study shows that oxygenator gas transfer characteristics can be studied in the clinical environment and that O2 transfer coefficients can be related to oxygenator design features.","PeriodicalId":77070,"journal":{"name":"Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics","volume":"13 2","pages":"167-77"},"PeriodicalIF":0.0,"publicationDate":"1992-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/0143-0815/13/2/009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12668486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

A monitoring device for pressurised-air-driven diaphragm-based artificial heart assist devices. 一种用于加压空气驱动的基于隔膜的人工心脏辅助装置的监测装置。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-05-01 DOI: 10.1088/0143-0815/13/2/008

F P Hoeben, F F de Mul, H S Stokkink, M H Koelink, J Greve

引用次数: 1

Accurate screening for abdominal aortic aneurysm. 准确筛查腹主动脉瘤。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-05-01 DOI: 10.1088/0143-0815/13/2/005

G M Grimshaw, M F Docker

引用次数: 29

High frequency eye tremor: reliability of measurement. 高频眼震颤:测量的可靠性。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-05-01 DOI: 10.1088/0143-0815/13/2/007

C Bolger, N Sheahan, D Coakley, J Malone

引用次数: 23

ECG gated radionuclide plethysmography--a method for the assessment of pulmonary systolic blood volume increase. 心电图门控放射性核素体积描记术——一种评估肺收缩血容量增加的方法。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-02-01 DOI: 10.1088/0143-0815/13/1/002

M Nitzan, Y Mahler, S Yaffe, R Marziano, M Bocher, R Chisin

引用次数: 9

Detection of cerebral ischaemia in the anaesthetised rat by impedance measurement with scalp electrodes: implications for non-invasive imaging of stroke by electrical impedance tomography. 头皮电极阻抗测量对麻醉大鼠脑缺血的检测:电阻抗断层扫描对卒中无创成像的意义。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-02-01 DOI: 10.1088/0143-0815/13/1/006

D S Holder

{"title":"Detection of cerebral ischaemia in the anaesthetised rat by impedance measurement with scalp electrodes: implications for non-invasive imaging of stroke by electrical impedance tomography.","authors":"D S Holder","doi":"10.1088/0143-0815/13/1/006","DOIUrl":"https://doi.org/10.1088/0143-0815/13/1/006","url":null,"abstract":"The possible use of impedance measurement with scalp electrodes to detect cerebral ischemia non-invasively was investigated in the anaesthetised rat. Global cerebral ischaemia was induced by diathermy of both vertebral arteries and reversible occlusion of the carotid arteries. Impedance was measured at 50 kHz by a four electrode method. With cortical electrodes in various positions, reversible impedance increases of 15 - 60% were recorded during episodes of cerebral ischaemia which lasted for 5 - 30 min. With electrodes placed in overlying positions in the scalp, impedance increases had a similar time course but their amplitudes were about 10 - 20% of the increases measured on the cortex. These were not due solely to changes in temperature which accompanied cerebral ischaemia or local changes in the scalp. These findings suggest that it may be possible to image cerebral ischaemia in human subjects non-invasively with Electrical Impedance Tomography and scalp electrodes.","PeriodicalId":77070,"journal":{"name":"Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics","volume":"13 1","pages":"63-75"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/0143-0815/13/1/006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12731192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 68

Measurement of regional myocardial blood flow using C15O2 and positron emission tomography: comparison of tracer models. 用C15O2和正电子发射断层扫描测量局部心肌血流:示踪剂模型的比较。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-02-01 DOI: 10.1088/0143-0815/13/1/001

A A Lammertsma, R De Silva, L I Araujo, T Jones

{"title":"Measurement of regional myocardial blood flow using C15O2 and positron emission tomography: comparison of tracer models.","authors":"A A Lammertsma, R De Silva, L I Araujo, T Jones","doi":"10.1088/0143-0815/13/1/001","DOIUrl":"https://doi.org/10.1088/0143-0815/13/1/001","url":null,"abstract":"Eight different modifications of the same single tissue compartment model to measure myocardial blood flow, based on inhalation of 15O-labelled CO2 and positron emission tomography, were assessed in both dogs and human normal volunteers. Several models provided results with the same degree of accuracy in dogs. However, a number of these models gave poorer results in humans. It was established that the model containing components for blood flow, fraction of water exchanging tissue and spill-over arterial blood volume provided the most accurate and reproducible results. This model contains inherent corrections for the limited spatial resolution of positron emission tomographs. For ease of computation, linearisation of the operational (fitting) equation was tested, but found not to be satisfactory. The left atrium was slightly better than the left ventricle for determining the arterial input function. Inclusion of the blood volume term in the fitting procedure was significantly better than subtracting blood volume prior to analysis, both in terms of accuracy and precision.","PeriodicalId":77070,"journal":{"name":"Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics","volume":"13 1","pages":"1-20"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/0143-0815/13/1/001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12731187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 43

Paediatric haemodialysis: estimation of treatment efficiency in the presence of urea rebound. 儿科血液透析:尿素反弹存在的治疗效率评估。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-02-01 DOI: 10.1088/0143-0815/13/1/005

S W Smye, J H Evans, E Will, J T Brocklebank

{"title":"Paediatric haemodialysis: estimation of treatment efficiency in the presence of urea rebound.","authors":"S W Smye, J H Evans, E Will, J T Brocklebank","doi":"10.1088/0143-0815/13/1/005","DOIUrl":"https://doi.org/10.1088/0143-0815/13/1/005","url":null,"abstract":"The 2-pool urea kinetic model has been developed analytically and applied to the description of the observed increase in blood levels of urea following dialysis (urea rebound), assuming that the dialyser urea clearance K less than 0.4X where X is the urea mass transfer coefficient between the intracellular and extracellular pools (volumes V1, V2 respectively). Urea generation was also neglected. Measurements were made in a group of six children suffering from chronic renal failure. From the model X, the efficiency of dialysis, and the equilibrium urea concentration C infinity were estimated in the presence of urea rebound using a blood urea measurement taken 90 min following start of dialysis, in addition to the conventional samples taken immediately pre- and post-dialysis. In three of the patients agreement between the experimental value of X derived from a multi-blood-sample technique post-dialysis, and the model value, was within 10%, for the range V1 = 0.4 W - 0.38 W, V2 = 0.2 W - 0.238 W, (W = patient's weight). Experimental values of X were in the range 93 - 300 ml min-1. Model estimates of C infinity were accurate to within 10%. An approximate technique was also developed which permitted an estimate of C infinity which was independent of V1, V2, K. The results indicated that C infinity was estimated to within 10% of the true equilibrium urea concentration. The error in the estimate of dialysis efficiency based on a single pool model was reduced by at least 50% using the model. The model may be applied clinically to the estimation of dialysis efficiency in the presence of significant urea rebound.","PeriodicalId":77070,"journal":{"name":"Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics","volume":"13 1","pages":"51-62"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/0143-0815/13/1/005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12731191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 76

Bone ultrasonic attenuation in women: reproducibility, normal variation and comparison with photon absorptiometry. 女性骨超声衰减:再现性、正常变化及与光子吸收测定法的比较。

Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics Pub Date : 1992-02-01 DOI: 10.1088/0143-0815/13/1/003

J G Truscott, M Simpson, S P Stewart, R Milner, C F Westmacott, B Oldroyd, J A Evans, A Horsman, C M Langston, M A Smith

{"title":"Bone ultrasonic attenuation in women: reproducibility, normal variation and comparison with photon absorptiometry.","authors":"J G Truscott, M Simpson, S P Stewart, R Milner, C F Westmacott, B Oldroyd, J A Evans, A Horsman, C M Langston, M A Smith","doi":"10.1088/0143-0815/13/1/003","DOIUrl":"https://doi.org/10.1088/0143-0815/13/1/003","url":null,"abstract":"The reproducibility of two methods of measuring broadband ultrasonic attenuation (BUA) in the calcaneus have been studied. An improvement in reproducibility in vivo from 9.6% to 2.8% between old and new techniques has been observed. Measurements of the calcaneus using BUA were correlated with measurements of bone mineral density measured by dual energy x-ray absorptiometry in the lumbar spine, femur and total body and bone mineral content in the distal and proximal forearm measured by single photon absorptiometry. For the older BUA technique the correlation coefficients ranged between r = 0.27 and r = 0.34. For the newer BUA technique the correlation coefficients ranged between r = 0.49 and r = 0.62 and were all significant (P less than 0.001).","PeriodicalId":77070,"journal":{"name":"Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics","volume":"13 1","pages":"29-36"},"PeriodicalIF":0.0,"publicationDate":"1992-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/0143-0815/13/1/003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12731189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 46