International journal of cardiac imaging最新文献

{"title":"The DICOM review stations: are they truly different?","authors":"B Goedhart,&nbsp;G J Brand,&nbsp;J H Reiber","doi":"10.1023/a:1006025826795","DOIUrl":"https://doi.org/10.1023/a:1006025826795","url":null,"abstract":"<p><p>Digital acquisition systems are widely used nowadays. The digitization of the cath lab environment is now directed towards the change in the exchange media from an analog (i.e. cinefilm) to a digital (i.e. CD-R) medium. An important consequence of this development is the need for another type of review system. This article focuses on the replacement of the cineprojector by a digital equivalent: the DICOM review station. Since the technologies differ fundamentally, the DICOM review station has very little in common with its analog predecessor. This article explains the basics of DICOM review stations. Different approaches, both in hardware and in software, are possible, each showing their advantages and drawbacks. The impact of choices made by the industry will be illustrated by a number of commercially available DICOM review stations. Further, the article discusses the topics of diagnostic image quality and performance. In our opinion, these are the major topics when it comes to an objective comparison of the capabilities of DICOM review stations. The relation of these subjects with design choices in terms of hardware and software are discussed.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 5","pages":"317-22"},"PeriodicalIF":0.0,"publicationDate":"1998-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006025826795","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21319231","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}

{"title":"The impact of vessel and catheter position on the measurement accuracy in catheter-based quantitative coronary angiography.","authors":"W Wunderlich,&nbsp;B Roehrig,&nbsp;F Fischer,&nbsp;H R Arntz,&nbsp;R Agrawal,&nbsp;A Morguet,&nbsp;H P Schultheiss,&nbsp;D Horstkotte","doi":"10.1023/a:1006067117225","DOIUrl":"https://doi.org/10.1023/a:1006067117225","url":null,"abstract":"<p><strong>Background: </strong>The calculation of absolute artery dimensions in quantitative coronary angiography is usually carried out by catheter calibration. It is based on the proportional comparison of the dimension of the imaged artery segment to the dimension of the imaged angiographic catheter of known size. This calibration method presumes an identical radiographic magnification between angiographic catheter and artery segment of interest. However, due to the different intrathoracic location of both objects the radiographic magnification or calibration factor is often not identical for a given angiographic projection. The aim of this study was to quantify the magnification error (out-of-plane magnification error) for the major coronary artery segments imaged in frequently used angiographic projections.</p><p><strong>Methods: </strong>The intrathoracic spatial location of 468 coronary segments (RCA 196, LAD 156, LCX 116) and their respective coronary catheters were established with biplane angiography and known imaging geometry data. The error in the radiographic magnification or calibration factor was then calculated for all 936 monoplane projections using the spatial coordinates and imaging geometry data.</p><p><strong>Results: </strong>The mean magnitude of magnification error was 4% within all 936 measurements. The magnitude and direction of error varied with the lesion localization and the angiographic projection angle (range -12.6% to +10.6%). The error characteristics could be described with six typical error groups by stratifying the data according to the three main coronaries and two angiographic planes. In 24% of measurements, the magnification error exceeded the 5.2% error limit acceptable for reference vessel sizing. Measurements of left coronary arteries were mainly affected by it.</p><p><strong>Conclusion: </strong>The magnification error contributes to the calibration error in measuring arterial dimensions by quantitative angiography. This error may affect the reliability of clinical studies and the proper sizing of interventional devices. These findings could be used to improve current error correction algorithms in order to reduce the effect of the magnification error in measuring arterial dimensions.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 4","pages":"217-27"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006067117225","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20840485","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}

{"title":"An echocardiographic and magnetic resonance imaging comparative study of right ventricular volume determination.","authors":"N Aebischer,&nbsp;R Meuli,&nbsp;X Jeanrenaud,&nbsp;J Koerfer,&nbsp;L Kappenberger","doi":"10.1023/a:1006055512362","DOIUrl":"https://doi.org/10.1023/a:1006055512362","url":null,"abstract":"<p><p>Assessment of right ventricular volume and function is important in many clinical settings involving heart or lung disease. However, the complexity of the right ventricular anatomy has prevented accurate volume determination by two-dimensional echocardiography. In the present study, 5 models incorporating standard echocardiographic views, were used to determine right ventricular volume in 10 human subjects. Two models were contingent on the true crescentic appearance of the right ventricle, whereas the remaining 3 calculated the right ventricular volume as a pyramid, an ellipsoid or other tapering geometrical figures, respectively. Subsequently, echocardiographic right ventricular volumes were compared to magnetic resonance imaging derived volumes. Correlation analysis and agreement measurement between the echocardiographic and magnetic resonance end-diastolic volume were performed in 10 out of 10 subjects and in 9 out of 10 subjects for the end-systolic volume. The 2 crescentic models resulted in the most reliable estimation of right ventricular volume. Those findings suggest that models based on right ventricular anatomical landmarks are feasible and should be preferred in echocardiographic studies.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 4","pages":"271-8"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006055512362","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20839408","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}

{"title":"Different left ventricular relaxation parameters in isolated working rat and guinea pig hearts. Influence of preload, afterload, temperature, and isoprenaline.","authors":"S F Langer,&nbsp;H D Schmidt","doi":"10.1023/a:1006083306901","DOIUrl":"https://doi.org/10.1023/a:1006083306901","url":null,"abstract":"<p><p>In isolated ejecting rat and guinea pig hearts, the sensitivity of the time constant tau of left ventricular isovolumic pressure fall, the maximum pressure fall velocity min LVdP/dt, and the relaxation time to different hemodynamic conditions, temperature, and isoprenaline were investigated. Tau was obtained by fitting the isovolumic pressure fall three-parametrically to the exponential p(t) = p infinity + (p0-p infinity) exp (-t/tau) which was found to be superior to semilogarithmic estimation. The influence of different working conditions on the relaxation parameters was tested by a rank correlation test and quantified by calculating standardized regression coefficients. Hemodynamic conditions were altered by changing left ventricular end-diastolic pressure (increasing inflow to the heart) and peak pressure (max LVP, varying aortic outflow resistance), and by atrial pacing (variation of interbeat interval). Lusitropic sensitivity was investigated by changing temperature and by applying isoprenaline. All regression parameters were only moderately sensitive to changes in end-diastolic pressure, max LVP, or heart rate, with the exception of a considerable afterload dependence of min LVdP/dt in rat hearts. This dependence, however, can be overcome to a large extent by dividing min LVdP/dt by mean aortic pressure. Isoprenaline strongly influenced all relaxation parameters, and so did temperature, except for relaxation time in guinea pig hearts. We conclude that tau serves as a reliable relaxation parameter, also in the hearts of small animals with heart rates up to 450 beats/min. In isolated hearts, min LVdP/dt, corrected for afterload dependence, is also suitable as a complementary index of the early relaxation phase.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 4","pages":"229-40"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006083306901","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20840489","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}

{"title":"Diagnosis of cardiac abnormalities in patients with nonischemic tachyarrhythmias: additional value of MR imaging.","authors":"H W Kayser,&nbsp;A de Roos,&nbsp;E E van der Wall","doi":"10.1023/a:1006008532380","DOIUrl":"https://doi.org/10.1023/a:1006008532380","url":null,"abstract":"<p><strong>Purpose: </strong>To assess the contribution of cardiac magnetic resonance (MR) imaging in the evaluation of patients with nonischemic tachyarrhythmias and equivocal diagnosis following echocardiography and cardiac angiography.</p><p><strong>Methods and results: </strong>Twenty-five patients with nonischemic tachyarrhythmias and equivocal diagnosis were studied using MR imaging. Before the MR examination all patients underwent two-dimensional echocardiography and cardiac catheterization. The type of additional information, obtained with MR imaging, ranged from confirming a suspected diagnosis in 5 patients (20%) to the identification of new important anatomic or functional information, allowing a correct diagnosis in 18 patients (72%). In two patients (8%) the MR diagnosis was incomplete.</p><p><strong>Conclusion: </strong>MR imaging may be an important additional diagnostic tool in the evaluation of cardiac abnormalities in patients with nonischemic tachyarrhythmias.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 4","pages":"279-85"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006008532380","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20839409","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}

{"title":"Tissue Doppler imaging and the quantification of myocardial function.","authors":"R Rambaldi,&nbsp;D Poldermans,&nbsp;W B Vletter,&nbsp;J J Bax,&nbsp;J R Roelandt","doi":"10.1023/a:1006075718177","DOIUrl":"https://doi.org/10.1023/a:1006075718177","url":null,"abstract":"<p><p>Tissue Doppler imaging (TDI) has recently been introduced in clinical echocardiography. Most widely used are tissue velocity maps, in which the velocity of moving tissue is calculated relative to the transducer from the Doppler shift and displayed as colour-encoded velocity maps in either M-mode or two-dimensional image formats (Doppler velocity mode). This allows detection and quantification of dyssynergic areas of the myocardium. Additionally, the velocities may be studied with pulsed wave-tissue Doppler sampling (PW-TDS) which displays the velocity of a selected myocardial region versus time with high temporal resolution. Less often used, are tissue acceleration maps which display acceleration or velocity change of subsequent frames as different colours (Doppler acceleration mode). These maps may find application in clinical electrophysiology. Another TDI modality is tissue energy imaging, which is based on the integration of the power spectrum of the Doppler signals from the tissue. This technique provides maps of Doppler energy which are represented as colour brightness. Such maps offer potential for the study of myocardial perfusion. TDI modalities have promise to become clinically useful for quantifying myocardial function.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 4","pages":"241-50; discussion 251-2"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006075718177","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20840491","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}

{"title":"Impact of presence of abnormal wall motion on echocardiographic determination of left ventricular function with automated boundary detection technique: re-evaluation.","authors":"G C Zhang,&nbsp;K Nakamura,&nbsp;T Tsukada,&nbsp;S Nakatani,&nbsp;M Uematsu,&nbsp;N Tanaka,&nbsp;Y Masuda,&nbsp;Y Yasumura,&nbsp;K Miyatake,&nbsp;M Yamagishi","doi":"10.1023/a:1006060105703","DOIUrl":"https://doi.org/10.1023/a:1006060105703","url":null,"abstract":"<p><p>It is still unclear whether echocardiography with an automated boundary detection technique (ABD) can accurately determine the left ventricular (LV) volume and function particularly in the presence of LV wall asynergy. We intended to re-evaluate the reliability and application of the ABD, which was based on the acoustic quantification technique (Sonos 2500, Hewlett Packard) for the LV volume measurement in patients without or with LV wall asynergy. A total of 80 patients (mean age 56 years) who underwent left ventriculography (LVG) were divided into two groups. The group A consisted of 29 patients with normal LV wall motion and the group B consisted of 51 patients with generalized or regional LV wall motion abnormality. In group A patients, the LV end-diastolic volume (LVEDV) was 96 +/- 25 ml by ABD and 112 +/- 33 ml by LVG and those of LV end-systolic volume (LVESV) were 44 +/- 14 ml by ABD and 48 +/- 17 ml by LVG, thus resulting in the underestimation of LV volume by 12% in average. Under these conditions, the LV ejection fraction (LVEF) by ABD, 54 +/- 8%, correlated well with that by LVG, 58 +/- 7%. Although underestimation of LV volume by 17% in average also occurred in groups B (N.S.), LVEF was found to correlate well with that by LVG; 27 +/- 8% vs 30 +/- 11% (r = 0.87, SEE = 3.1%) for 21 patients with the generalized LV asynergy; 39 +/- 10% vs 39 +/- 12% (r = 0.86. SEE = 3.3%) for 30 patients with the regional LV asynergy. These results demonstrate the feasibility of the ABD in determining the LVEF, although underestimation can occur in measuring the absolute LV volume in patients with or without LV asynergy.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 4","pages":"253-9"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006060105703","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20840493","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}

{"title":"The role of early measurement of nitrogen-13 ammonia uptake for predicting contractile recovery after acute myocardial infarction.","authors":"P Lancellotti,&nbsp;P G Mélon,&nbsp;C M de Landsheere,&nbsp;C Degueldre,&nbsp;H E Kulbertus,&nbsp;L A Piérard","doi":"10.1023/a:1006042400386","DOIUrl":"https://doi.org/10.1023/a:1006042400386","url":null,"abstract":"<p><p>Previous studies have shown that the maintenance of cell membrane integrity and metabolism requires the persistence of residual myocardial blood flow. The purpose of this study was to assess the role of N-13 ammonia positron emission tomographic (PET) imaging performed early after an acute myocardial infarction for predicting functional recovery. Seventeen patients with an acute myocardial infarction were included in the study. Thirteen received thrombolytic therapy, 2 underwent immediate angioplasty of the infarct-related artery and 2 were treated with heparin. N-13 ammonia imaging was performed 6 +/- 2 days after the acute event and was followed by elective angioplasty in 13 patients. Using a 16-segment polar map display, regional N-13 ammonia uptake was expressed as a percentage of maximal segmental uptake and classified as normal (> 63%), moderately reduced (63-50%) and severely reduced (< 50%) based on values of tracer uptake obtained from healthy subjects. By echocardiographic assessment of regional wall thickening within 96 hours and at 1 month after the infarct, we examined the relationship between blood flow and functional outcome of myocardial segments in the infarct-related area. Regional wall thickening was graded on a 4-point scale: normal (1), hypokinesia (2), akinesia (3) and dyskinesia (4). Of 77 dyssynergic segments at baseline echocardiographic study, 43 had normal flow, 15 moderately reduced flow and 19 severely reduced flow. Segments with N-13 ammonia uptake > or = 50% demonstrated a significant improvement in wall thickening score at follow-up (p < 0.001), whereas segments with N-13 ammonia uptake < 50% showed no improvement in wall thickening scores (p < 0.001). The proportion of segments improving contractility by at least 1 score was significantly higher in the group of segments with N-13 ammonia uptake > 63%. The predictive value for defining functional recovery with segmental N-13 ammonia uptake > 63% was 86%. The predictive value for absence of recovery (uptake < 50%) was 54%. In conclusion, our data showed that early after an acute myocardial infarction N-13 ammonia imaging provides information regarding functional outcome.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 4","pages":"261-7; discussion 269-70"},"PeriodicalIF":0.0,"publicationDate":"1998-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006042400386","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20840494","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}

{"title":"Impending paradoxical embolus: clinical imaging and successful surgical treatment.","authors":"J M van Dantzig,&nbsp;E C Cheriex,&nbsp;G Snoep,&nbsp;K B Prenger","doi":"10.1023/a:1006092525412","DOIUrl":"https://doi.org/10.1023/a:1006092525412","url":null,"abstract":"<p><p>In a patient with pulmonary emboli, transesophageal echocardiography showed a thrombus straddling the foramen ovale (impending paradoxical embolism). Proximal pulmonary emboli were visualized by spiral computed tomography and subsequent surgical treatment, consisting of removal of intracardiac clot, closure of the open foramen ovale and pulmonary embolectomy, was successful.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 3","pages":"167-70"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006092525412","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20725725","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}

{"title":"Assessment of coronary blood flow in humans using phase difference MR imaging. Comparison with intracoronary Doppler flow measurement.","authors":"W Kessler,&nbsp;W Moshage,&nbsp;A Galland,&nbsp;D Zink,&nbsp;S Achenbach,&nbsp;W Nitz,&nbsp;G Laub,&nbsp;K Bachmann","doi":"10.1023/a:1005976705707","DOIUrl":"https://doi.org/10.1023/a:1005976705707","url":null,"abstract":"<p><p>Coronary blood flow quantification provides essential information on the hemodynamic significance of coronary artery stenoses. Recently, magnetic resonance (MR) flow mapping has emerged as a new promising method to noninvasively determine flow velocity and flow volume within the coronary arteries. The aim of this study was to compare phase difference (PD) MR flow quantification with intracoronary Doppler flow measurements in 15 patients with suspected or known coronary artery disease. Flow quantification was attempted before and after systemic application of 5mg Isosorbiddinitrate (ISDN) in order to determine possible alterations in coronary flow volume. PD MR flow mapping was performed successfully in 13 of the 15 patients. For flow velocities and flow volume values, a close correlation between PD MR and Doppler flow measurements was found (r = 0.79 and r = 0.90, respectively). However, average flow measured by PD MR was significantly lower than the invasively obtained values (9.0 +/- 4.4 cm/sec vs. 11.7 +/- 4.9 cm/sec; p < 0.001 and 46.3 +/- 28.7 ml/min vs. 53.4 +/- 32.8 ml/min; p < 0.05). Although the mean flow volume remained constant in the entire patient group after ISDN application, individual changes (increase in 6, decrease in 4 cases) could be documented with PD MR imaging and showed a good correlation to the Doppler method (r = 0.82). In conclusion, PD MR flow mapping is a promising method for the noninvasive quantification of coronary blood flow and therefore offers the potential of assessing coronary artery stenoses. However, technical improvements are mandatory in order to increase accuracy of the method.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"14 3","pages":"179-86; discussion 187-9"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1005976705707","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20725727","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}