Evaluation of New Software for Angiographic Determination of Right Ventricular Volumes

Wellnhofer, Ernst; Ewert, Peter; Hug, Jürgen; Wang, Hui; Kretschmar, Oliver; Chavengsuk, Disthapron; Kühne, Titus; Abdul‐Khaliq, Hashim; Nagel, Eike; Lange, Peter; Fleck, Eckart

doi:10.1007/s10554-005-1797-7

Cited by 9 publications

(12 citation statements)

References 16 publications

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“…The absolute amount of resin in the ventricles was determined by the capacity of the more compliant right ventricle, necessitating clamping of the aorta before the pulmonary artery. The actual comparison with other cast studies [1] now shows that this method appears to preserve the shape of the right ventricle to a high degree.…”

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confidence: 75%

“…The area-length method can be applied also for rotated projections. From the now presented results [1] it can be recommended always to apply the area-length method.…”

mentioning

confidence: 98%

“…In this issue of the International Journal of Cardiovascular Imaging, Wellnhofer et al [1] report on the validation of angiographic right ventricular volume determination using magnetic resonance imaging as gold standard. Besides, there is another paper in this volume that is based on angiographic volume determination [2].…”

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confidence: 99%

“…Both cited papers [1,2] on quantitative angiographic evaluation of the right ventricle recommend the use of analytical (or geometrical) calibration utilising an advantage inherent to a biplane multi-axial system: The biplane imaging geometry may be used to calculate the magnification at each point that can be identified in both projections. In its simplest case, the analytical calibration technique assumes the object to be located at the common isocentre of gantry.…”

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confidence: 99%

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Angiographic Determination of Right Ventricular Volumes

Onnasch

Fischer

Kramer

2005

Int J Cardiovasc Imaging

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In response to the article by E. Wellnhofer et al. (Int. J. Cardiovasc. Imaging 21,[575][576][577][578][579][580][581][582][583][584][585] In this issue of the International Journal of Cardiovascular Imaging, Wellnhofer et al.[1] report on the validation of angiographic right ventricular volume determination using magnetic resonance imaging as gold standard. Besides, there is another paper in this volume that is based on angiographic volume determination [2]. It describes right ventricular function after repair of tetralogy of Fallot using not only end-diastolic and end-systolic volumes but also the volume curve over a complete cardiac cycle.The angiographic determination of the ventricular volumes belongs to the oldest methods of quantitative image analysis. The basic techniques were developed 30 years ago, before digital imaging and multi-axial gantries were at our disposal in the catheterization laboratory. Other powerful image modalities were developed like echocardiography, cardiac magnetic resonance tomography and fast multi-slice computed tomography. The question arises whether it is still worthwhile to quantify right ventricular volumes from angiography. Are the results sufficient and accurate? And if the answers are yes, which method for angiographic right ventricular volume determination should be used in clinical routine? We will try to answer these questions based on the results of Wellnhofer et al.The assessment of the right ventricular volume and function is important for prognostic prediction and clinical decision making especially in paediatric cardiology. Although echocardiography has replaced angiocardiography for the diagnosis and follow-up of many patients, catheterization and the recording of angiograms are inevitable where local pressures and oxygen saturation should be measured or interventional procedures should be performed. Also the development of cardiac magnetic resonance tomography will not completely remove the more flexible and cost-efficient X-ray angiography. Especially for complex heart diseases and in paediatric cardiology the quantitative evaluation of the right ventricular size and function from angiograms are still of great importance.Using angiocardiography the ventricular volumes can be estimated from the opacified ventricular silhouettes only with the aid of model assumptions. There is no doubt that the variable and complex shape of the right ventricle cannot be approximated accurately from one projection alone. For the normal heart the combined use of the frontal and lateral views are well suited. However, for complex heart diseases other orthogonal projections may also be utilized. There are two approved techniques to calculate the volume from these projections: the area-length method and the multiple slices method. These techniques use the same information in a different order: either multiplication follows integration (of the silhouettes) or integration follows multiplication (of orthogonal diameters). In each case, the result has to be corrected to the true volume of ...

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mentioning

confidence: 75%

“…The area-length method can be applied also for rotated projections. From the now presented results [1] it can be recommended always to apply the area-length method.…”

mentioning

confidence: 98%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Angiographic Determination of Right Ventricular Volumes

Onnasch

Fischer

Kramer

2005

Int J Cardiovasc Imaging

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“…In 2008 Indik et al described a method of objective assessment of RV wall motion with computer based analysis using customised software [9]. In addition software is available to measure RV volumes and ejection fraction [10]. But so far such software is not in routine use and subjective assessment remains the main tool of assessment, which does however, varies between observers and is subject to error.…”

Section: Rv Angiography Is a Well-described Technique And Provides Imentioning

confidence: 99%

Right ventricular morphology on catheter angiography: Variations and its implications for the diagnosis of arrhythmogenic right ventricular cardiomyopathy

Ahmed

Smith

Ruygrok

et al. 2012

Heart, Lung and Circulation

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Right ventricular volume analysis by angiography in right ventricular cardiomyopathy

Indik

Dallas

Gear

et al. 2011

Int J Cardiovasc Imaging

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Introduction Imaging of the right ventricle (RV) for the diagnosis of arrhythmogenic right ventricular cardiomyopathy/dysplasia (ARVC/D) is commonly performed by echocardiography or magnetic resonance imaging (MRI). Angiography is an alternative modality, particularly when MRI cannot be performed. We hypothesized that RV volume and ejection fraction computed by angiography would correlate with these quantities as computed by MRI. Methods and Results RV volumes and ejection fraction were computed for subjects enrolled in the North American ARVC/D Registry, with both RV angiography and MRI studies. Angiography was performed in the 30° right anterior oblique (RAO) and 60° left anterior oblique (LAO) views. Angiographic volumes were computed by RAO view and two-view (RAO and LAO) formulae. 17 subjects were analyzed (11 men and 6 women), with 15 subjects classified as affected, and 2 as unaffected by modified Task Force criteria. The correlation coefficient of MRI to the two-view angiographic analysis was 0.76 for end-diastolic volume and 0.79 for ejection fraction. Angiographically derived volumes were larger than MRI derived volume (p=0.006) and with the slope in a linear relationship equal to 0.8 for end diastolic volume, and 0.9 for RV ejection fraction (p<0.001), computed by the two view formula. The RAO view formula was significantly related to the MRI derived quantities, but with lower correlation coefficients (0.36 for volume and 0.73 for ejection fraction). Conclusion End-diastolic volume and ejection fraction of the RV can be obtained by angiography and correlates with these quantities as obtained by MRI.

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Evaluation of New Software for Angiographic Determination of Right Ventricular Volumes

Cited by 9 publications

References 16 publications

Angiographic Determination of Right Ventricular Volumes

Angiographic Determination of Right Ventricular Volumes

Right ventricular morphology on catheter angiography: Variations and its implications for the diagnosis of arrhythmogenic right ventricular cardiomyopathy

Right ventricular volume analysis by angiography in right ventricular cardiomyopathy

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