International journal of cardiac imaging最新文献

Left ventricular myocardial tagging. 左心室心肌标记。

International journal of cardiac imaging Pub Date : 2004-01-01 DOI: 10.1007/978-3-7985-1932-9_11

F. Rademakers, J. Bogaert

引用次数: 6

Transient streamlines: texture synthesis for in vivo flow visualisation. 瞬态流线:体内流动可视化的纹理合成。

International journal of cardiac imaging Pub Date : 2000-06-01 DOI: 10.1023/a:1006418406598

G Z Yang, P J Kilner, R H Mohiaddin, D N Firmin

{"title":"Transient streamlines: texture synthesis for in vivo flow visualisation.","authors":"G Z Yang, P J Kilner, R H Mohiaddin, D N Firmin","doi":"10.1023/a:1006418406598","DOIUrl":"https://doi.org/10.1023/a:1006418406598","url":null,"abstract":"Magnetic resonance (MR) imaging is a versatile technique for providing detailed information on blood vessel morphology and function. With its ability to acquire multi-dimensional cine flow data, MR is also an important tool for providing insight into blood flow patterns in vivo. The purpose of this paper is to describe the application of texture synthesis for flow visualisation. Two related issues are addressed, one is the removal of image noise from the acquired velocity data to ensure a correct representation of the underlying flow structure, and the other is the formation of transient streamlines through flow texture synthesis. The process of noise removal is achieved by using a convex projection algorithm based on the principle of mass conservation, whereas transient streamlines are formed via an iterative orientated pattern formation and enhancement procedure. The method described provides realistic visualisation of the flow patterns and avoids distortions caused by integration errors associated with conventional streamline tracking techniques. Effectiveness of the method applied to MR flow data acquired in healthy volunteers and patients is demonstrated.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"16 3","pages":"175-84"},"PeriodicalIF":0.0,"publicationDate":"2000-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006418406598","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21964730","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: 5

Accuracy of MRI evaluation of pulmonary blood supply in patients with complex pulmonary stenosis or atresia. MRI评价复杂肺动脉狭窄或闭锁患者肺血供的准确性。

International journal of cardiac imaging Pub Date : 2000-06-01 DOI: 10.1023/a:1006486225047

A J Powell, T Chung, M J Landzberg, T Geva

{"title":"Accuracy of MRI evaluation of pulmonary blood supply in patients with complex pulmonary stenosis or atresia.","authors":"A J Powell, T Chung, M J Landzberg, T Geva","doi":"10.1023/a:1006486225047","DOIUrl":"https://doi.org/10.1023/a:1006486225047","url":null,"abstract":"Detailed imaging of pulmonary artery (PA) anatomy and significant aorto-pulmonary collaterals (APCs) is crucial for surgical planning and follow-up in patients with complex congenital heart disease (CHD) and pulmonary stenosis or atresia. Because examination by echocardiography is often technically limited and catheterization is invasive, this study evaluated the diagnostic accuracy of magnetic resonance imaging (MRI) as an alternate non-invasive tool. Thirteen patients (median age 28 years, range: 1-44 years) underwent both cardiac catheterization and MRI within a median of two months (range 0.1-8 months). Diagnoses included tetralogy of Fallot (TOF) with pulmonary atresia (n = 8), TOF with pulmonary stenosis (n = 2), single left ventricle with pulmonary stenosis (n = 2), and complex heterotaxy with pulmonary stenosis (n = 1). The MRI sequences used in this study were ECG-gated spin echo and gradient echo sequences acquired in multiple planes. Compared to catheterization, MRI had 100% sensitivity and specificity for the diagnosis of main PA (n = 6) and branch PA (n = 13) hypoplasia or stenosis, as well as discontinuous (n = 4) or absent (n = 10) branch PAs. There was complete agreement between catheterization and MRI identification of significant APCs (n = 18). Main PA atresia was noted by MRI in four patients but was not definitively seen by catheterization in any. MRI but not catheterization precisely defined the distance between discontinuous PAs and their relationship to other mediastinal structures. In conclusion, cardiac MRI is a reliable non-invasive imaging modality to define PA and APC anatomy in patients with complex pulmonary stenosis or atresia.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"16 3","pages":"169-74"},"PeriodicalIF":0.0,"publicationDate":"2000-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006486225047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21964729","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: 38

Aortic root asymmetry in marfan patients; evaluation by magnetic resonance imaging and comparison with standard echocardiography. 马凡氏病患者主动脉根部不对称的研究磁共振成像评价及与标准超声心动图比较。

International journal of cardiac imaging Pub Date : 2000-06-01 DOI: 10.1023/a:1006429603062

L J Meijboom, M Groenink, E E van der Wall, H Romkes, J Stoker, B J Mulder

{"title":"Aortic root asymmetry in marfan patients; evaluation by magnetic resonance imaging and comparison with standard echocardiography.","authors":"L J Meijboom, M Groenink, E E van der Wall, H Romkes, J Stoker, B J Mulder","doi":"10.1023/a:1006429603062","DOIUrl":"https://doi.org/10.1023/a:1006429603062","url":null,"abstract":"Background: Patients with Marfan syndrome may develop aortic root dissection despite only mild aortic root dilation as shown by standard echocardiography, which may be due to aortic root asymmetry. Purpose of the present study was to investigate aortic root asymmetry by magnetic resonance (MR) imaging in patients with Marfan syndrome and to compare these measurements with standardly performed echocardiography.Methods: Eighty-seven Marfan patients (mean age 31 +/- 8 years) underwent MR imaging. From this population, 15 patients (mean age 29 +/- 3 years) were selected in whom both echocardiography and MR imaging had been performed within 3 months. With echocardiography, the aortic root was measured according to the recommendations of the American Society of Echocardiography. With MR imaging, a short axis view of the aortic root was obtained to measure distances between the noncoronary, right coronary and left coronary cusps and the aortic root area. Correlations between aortic root area and diameters were assessed, and 95% confidence intervals (95% CIs) calculated.Results: No difference in the standardly measured noncoronary to right coronary cusp diameter between MR imaging and echocardiography was shown (42 +/- 6 mm). Largest aortic root diameter on the MR images was the right to left coronary cusp diameter (46 +/- 7 mm, p < 0.02). For a given noncoronary to right coronary cusp diameter, 95% confidence intervals revealed a variation of -20 to +20% in the aortic root area.Conclusions: The majority of Marfan patients show asymmetric dilation of the aortic root by MR imaging. This phenomenon may go unnoticed when standard echocardiography is performed. The asymmetry of the aortic root might be of clinical importance in unexpected aortic root dissection.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"16 3","pages":"161-8"},"PeriodicalIF":0.0,"publicationDate":"2000-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006429603062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21964728","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: 74

Comparative evaluation of TEE, conventional MRI and contrast-enhanced 3D breath-hold MRA in the post-operative follow-up of dissecting aneurysms. TEE、常规MRI及增强3D屏气MRI在夹层动脉瘤术后随访中的比较评价。

International journal of cardiac imaging Pub Date : 2000-06-01 DOI: 10.1023/a:1006404824873

E Di Cesare, A V Giordano, G Cerone, F De Remigis, G Deusanio, C Masciocchi

{"title":"Comparative evaluation of TEE, conventional MRI and contrast-enhanced 3D breath-hold MRA in the post-operative follow-up of dissecting aneurysms.","authors":"E Di Cesare, A V Giordano, G Cerone, F De Remigis, G Deusanio, C Masciocchi","doi":"10.1023/a:1006404824873","DOIUrl":"https://doi.org/10.1023/a:1006404824873","url":null,"abstract":"Purpose: To verify the diagnostic potentialities of conventional magnetic resonance imaging (MRI), breath-hold 3D contrast enhanced MR angiography (C3D MRA) and transesophageal echocardiography (TEE) in patients surgically treated for type A aortic dissection.Materials and methods: Twenty-nine patients (21 males and 8 females), surgically treated for type A aortic dissection, were evaluated with MRI using a 1.5 T (GE Horizon Echospeed 8.2) with standard gated SE sequences and breath-hold 3D fast SPGR after intravenous Gd injection (0.2 mmol/kg). 3D MIP reconstruction was obtained. TEE evaluation was performed with a HP 2000 system and a biplane 5 MHz probe. The sizes of aortic root, distal anastomosis, descending aorta and periprosthetic thickening were measured. Regional false lumen and aortic branch involvement were also evaluated.Results: Concordance among TEE, conventional MRI and C3D MRA was observed in the evaluation of aortic root (MRI vs. C3D MRA r = 0.93; MRI vs. TEE r = 0.84; C3D MRA vs. TEE r = 0.84) and descending aorta (r = 0.94, 0.91 and 0.92, respectively). The interobserver variability was also very low. Inadequate agreement was observed for distal anastomosis. C3D MRA was inadequate in the evaluation of periprosthetic thickening; r = 0.73 was obtained between MRI and TEE. For qualitative data: TEE was inadequate in the evaluation of the abdominal aorta and branches. C3D MRA depicted supra-aortic vessel involvement in more cases than the other techniques.Conclusion: C3D MRA is a fast and accurate technique in the evaluation of the endoluminal alterations and involvement of the aortic branches. Conventional MRI allows a direct evaluation of the aortic wall and periaortic tissue. TEE is less accurate in the evaluation of aortic branches and abdominal aorta.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"16 3","pages":"135-47"},"PeriodicalIF":0.0,"publicationDate":"2000-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006404824873","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21966310","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: 67

Value of navigator echo magnetic resonance angiography in detecting occlusion/patency of arterial and venous, single and sequential coronary bypass grafts. 导航仪回声磁共振血管造影在检测动脉、静脉闭塞/通畅、单次和顺序冠状动脉旁路移植术中的价值。

International journal of cardiac imaging Pub Date : 2000-06-01 DOI: 10.1023/a:1006432027712

G Molinari, F Sardanelli, F Zandrino, M Balbi, M A Masperone

{"title":"Value of navigator echo magnetic resonance angiography in detecting occlusion/patency of arterial and venous, single and sequential coronary bypass grafts.","authors":"G Molinari, F Sardanelli, F Zandrino, M Balbi, M A Masperone","doi":"10.1023/a:1006432027712","DOIUrl":"https://doi.org/10.1023/a:1006432027712","url":null,"abstract":"Aim of our work was to validate magnetic resonance angiography (MRA) in detecting occlusion/patency of coronary artery bypass grafts. Twenty patients with previous history of bypass surgery and recurrent episodes of chest pain were enrolled. Two patients could not be studied (claustrophobia, erratic breathing). Thus, 18 patients with 51 bypasses were examined using a navigator echo sequence: 21 arterial grafts (six sequential) and 30 saphenous vein grafts (five sequential). All patients had undergone contrast conventional angiography 3-15 days before MRA. The magnetic resonance (MR) data set was analyzed by two independent readers blinded to the results of conventional angiography (occlusion of 12 of 51 grafts). At magnetic resonance, two bypasses of the posterior descending artery, patent at conventional angiography, could not be visualized because of imaging slab malpositioning. Interobserver concordance was 96% (47/49). Magnetic resonance and conventional angiography provided identical answers in 47 out of 49 (96%) of the examined grafts. Eleven out of 12 occluded grafts and 36 out of 37 patent grafts were correctly identified with MR. As far as occlusion is concerned, the sensitivity of MR was 91%, the specificity 97%. To summarize, a 30 min outpatient MR examination is highly reliable in determining occlusion/patency of arterial and venous, single and sequential bypasses.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"16 3","pages":"149-60"},"PeriodicalIF":0.0,"publicationDate":"2000-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006432027712","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21966311","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: 38

Assessment of coronary compensatory enlargement by three-dimensional intravascular ultrasound. 三维血管内超声评价冠状动脉代偿性扩大。

International journal of cardiac imaging Pub Date : 2000-04-01 DOI: 10.1023/a:1006333619358

J D Klingensmith, D G Vince, B D Kuban, R Shekhar, E M Tuzcu, S E Nissen, J F Cornhill

{"title":"Assessment of coronary compensatory enlargement by three-dimensional intravascular ultrasound.","authors":"J D Klingensmith, D G Vince, B D Kuban, R Shekhar, E M Tuzcu, S E Nissen, J F Cornhill","doi":"10.1023/a:1006333619358","DOIUrl":"https://doi.org/10.1023/a:1006333619358","url":null,"abstract":"Several techniques have been used to demonstrate that human arteries respond to atherosclerosis by increasing their total arterial area to prevent a decrease in blood flow. Three-dimensional reconstructions of coronary arteries can document this compensatory response accurately and specifically. Seven human coronary arteries were reconstructed using intravascular ultrasound and biplane angiography, and vessel geometries were quantified. In all seven vessels, as plaque area increased, overall vessel area increased (R = 0.986, 0.933, 0.984, 0.678, 0.763, 0.963, and 0.830), but luminal cross-sectional area did not significantly decrease. Focal compensatory enlargement was identified in each vessel, and in some cases this response appeared to occur until the vessel was 65% occluded. Luminal enlargement near the proximal ends was attributed to the natural taper of the vessel. The semi-automated, three-dimensional segmentation technique used in this study allows reproducible quantification, as there is no subjective manual tracing involved. Following the intravascular ultrasound transducer in time and space with biplane angiography allows for accurate reconstruction with or without automated pullback devices. Information on the rate of change of vessel measurements is also presented, which, when combined with visualization of accurate 3D geometry, provides a unique assessment of coronary compensatory enlargement. This reconstruction technique can be applied in a clinical environment with no major modification.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"16 2","pages":"87-98"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006333619358","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21767452","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: 38

Constrictive pericarditis from an embolized hypodermic needle: radiographic, CT and MR imaging findings. 皮下针头栓塞引起的缩窄性心包炎:x线、CT和MR影像表现。

International journal of cardiac imaging Pub Date : 2000-04-01 DOI: 10.1023/a:1006393217610

J C Trent, T K Lau, A Kawashima

引用次数: 1

Absolute value of the difference of Tl-201 uptake between redistribution and rest is a specific marker of myocardial viability. 再分布与静息之间Tl-201摄取差值的绝对值是心肌活力的特异性标志。

International journal of cardiac imaging Pub Date : 2000-04-01 DOI: 10.1023/a:1006338226409

M Dziuk, D Borkowski, W Kwiatkowski, A Cwetsch, M Cholewa

{"title":"Absolute value of the difference of Tl-201 uptake between redistribution and rest is a specific marker of myocardial viability.","authors":"M Dziuk, D Borkowski, W Kwiatkowski, A Cwetsch, M Cholewa","doi":"10.1023/a:1006338226409","DOIUrl":"https://doi.org/10.1023/a:1006338226409","url":null,"abstract":"Although Tl-201 rest redistribution SPECT is widely used to assess myocardial viability, there is no agreement on the best prognostic marker of left ventricle contraction improvement after revascularization. More recent data suggest that not only rest or redistribution uptake but also reverse redistribution patterns may serve to indicate the viability of myocardium. The aim of this study was to define criteria (which include reversibility and reverse redistribution) for viability testing and prediction of functional outcome in Tl-201 rest redistribution SPECT. Twenty-five patients with left ventricle dyssynergy were studied before and after revascularization with Tl-201 SPECT and echocardiography. Perfusion and contractility was assessed in a 16-segment model of the left ventricle. Out of 400 left ventricular segments, contraction disturbances of various degree of intensity (hypokinesis, akinesis and dyskinesis) were found by echocardiography in 107 segments. Revascularization was performed in 97 segments. In 57% of the segments, improvement of contraction was observed after PTCA or CABG. Perfusion was analysed in the segments between segments with and without contraction improvement. In discriminant analysis, only the modulus of difference between rest and redistribution study > or = 10% was the common parameter for hypo-, a- and dyskinetic segments to predict the functional recovery of left ventricle (LV) with the specificity of 93% and sensitivity of 78%. The modulus of segmental quantitative difference between redistribution and rest image is a new parameter adding specificity to Tl-201 rest redistribution SPECT in prediction of recovery of left ventricle function.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"16 2","pages":"99-104"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006338226409","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21767453","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: 2

Three-dimensional reconstruction of the coronary artery wall by image fusion of intravascular ultrasound and bi-plane angiography. 血管内超声与双平面血管造影图像融合的冠状动脉壁三维重建。

International journal of cardiac imaging Pub Date : 2000-04-01 DOI: 10.1023/a:1006304419505

R M Cothren, R Shekhar, E M Tuzcu, S E Nissen, J F Cornhill, D G Vince

{"title":"Three-dimensional reconstruction of the coronary artery wall by image fusion of intravascular ultrasound and bi-plane angiography.","authors":"R M Cothren, R Shekhar, E M Tuzcu, S E Nissen, J F Cornhill, D G Vince","doi":"10.1023/a:1006304419505","DOIUrl":"https://doi.org/10.1023/a:1006304419505","url":null,"abstract":"Background: Intravascular ultrasound (IVUS) is becoming increasingly accepted for assessing coronary anatomy. However, its utility in visualizing and quantifying coronary morphology has been limited by its 2D tomographic nature. This study presents a 3D reconstruction technique that accurately preserves 3D geometric information.Methods and results: Images obtained from manual IVUS pullbacks and continuous bi-plane angiography were fused, using angiography to reconstruct the transducer trajectory and aid in solving for the correct rotational orientation. A novel 3D active surface method automatically identified the luminal and medial-adventitial borders which, when superimposed on the transducer trajectory, could be surface-rendered for visualization and morphometry. Segmentation agreed well with manual assessment, and 3D luminal shape matched that of angiography when projected to 2D.Conclusions: We conclude that this method provides an accurate reconstruction of the vessel's anatomy, which accounts for the true curvature of the vessel.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"16 2","pages":"69-85"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006304419505","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21767451","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