Noncontrast 3D CMR Imaging for Aortic Valve Annulus Sizing in TAVR

Gopal, Ambarish; Grayburn, Paul A.; Mack, Michael; Chacon, Isabel; Kim, Rebeca; Montenegro, Debbie E.; Phan, Teresa K.; Rudolph, Jill; Filardo, Giovanni; Mack, Michael J.; Gopalakrishnan, Deepika

doi:10.1016/j.jcmg.2014.11.011

Cited by 24 publications

(10 citation statements)

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“…18,19 The use of automated algorithms is feasible in daily routine with accurate and reproducible results. [20][21][22][23][24][25] Infrequently, patients may have annulus sizes for which no suitable prostheses are currently available (e.g. diameters less than 18 mm or greater than 31 mm).…”

Section: • Minimization Of Cardiac Motion Artefacts Is Achieved Bymentioning

confidence: 99%

CT support of cardiac structural interventions

Hell

Achenbach

2019

BJR

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The most frequent indication of cardiac CT imaging is to detect and rule out coronary artery stenosis. 1-3 Intravenous contrast is injected for the purpose of coronary lumen visualization and the procedure is referred to as "coronary CT angiography" (CTA). In a broader sense, "cardiac CTA" refers to contrast-enhanced visualization of the morphology and structure of the entire heart and adjacent great vessels. In fact, due to its high spatial resolution which is well below 1 mm in all orientations, contrast-enhanced cardiac CT imaging has emerged as a valuable tool for morphological cardiac imaging in the past years. 4 With their close to isotropic spatial resolution, modern CT scanners allow the reconstruction of data sets in any desired plane without losing the ability to visualize small structures and perform exact measurements.

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Section: • Minimization Of Cardiac Motion Artefacts Is Achieved Bymentioning

confidence: 99%

CT support of cardiac structural interventions

Hell

Achenbach

2019

BJR

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“…Non-contrast whole heart MR has recently been proposed for assessment of the aortic annulus prior to TAVR, and demonstrated good agreement with CTA [6, 7] . A limitation of this technique is the long image acquisition time (average of 14 minutes per Ruile et al) for analysis of the aortic annulus alone, suggesting that prolonged imaging would be required for the combined evaluation of annulus and peripheral access that we present with ferumoxytol MRA.…”

Section: Discussionmentioning

confidence: 99%

Ferumoxytol MRA for transcatheter aortic valve replacement planning with renal insufficiency

Kallianos

Henry

Yeghiazarians

et al. 2017

International Journal of Cardiology

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Background Computed tomography angiography (CTA) is the test of choice for pre-procedure imaging of transcatheter aortic valve replacement (TAVR) candidates. The iodinated contrast required, however, increases the risk of renal dysfunction in patients with pre-existing renal failure. Ferumoxytol is a magnetic resonance imaging (MRI) contrast agent that can be used with renal failure. Its long vascular resonance time allows gated MRA sequences that approach CTA in image quality. We present respiratory and cardiac gated MRA enabled by ferumoxytol that can be post-processed in an analogous fashion to CTA. Methods Seven patients with renal failure presenting for TAVR were imaged with respiratory and cardiac gated MRA at 3T using ferumoxtyol for contrast. Aortic annulus, root and peripheral access dimensions were calculated in a fashion identical to that used for CTA. Of these, 6 patients underwent a TAVR procedure and 5 had intraoperative valve assessment with transesophageal echocardiograph (TEE) using standard clinical protocols that employed both two- and three-dimensional techniques. Results Good correlation between MRA aortic annulus measurements and those from TEE were shown in 5 patients with mean annulus area of 392.4 mm2 (290–470 range) versus 374.1 mm2 (285–440 range), with a pairwise correlation coefficient of 0.92, p=0.029. All patients received Sapien valve implants (one 20 mm, three 23 mm, and two 26 mm valves). Access decisions were guided by MRA with no complications. Annulus sizing resulted in no greater than trace/mild aortic regurgitation in all patients. Conclusions Ferumoxytol MRA is a safe alternative to CTA in patients with renal failure for pre-TAVR analysis of the aortic root and peripheral access.

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“…CT_Vol was defined as the standard reference volume. Aquarius iNtuition viewer is helpful software for volumetric analysis; previous studies have used it for several organs, such as the liver, heart, and kidney [ 31 , 32 , 33 , 34 ].…”

Section: Methodsmentioning

confidence: 99%

Advanced Kidney Volume Measurement Method Using Ultrasonography with Artificial Intelligence-Based Hybrid Learning in Children

Kim

Ahn

Kim

et al. 2021

Sensors

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In this study, we aimed to develop a new automated method for kidney volume measurement in children using ultrasonography (US) with image pre-processing and hybrid learning and to formulate an equation to calculate the expected kidney volume. The volumes of 282 kidneys (141 subjects, <19 years old) with normal function and structure were measured using US. The volumes of 58 kidneys in 29 subjects who underwent US and computed tomography (CT) were determined by image segmentation and compared to those calculated by the conventional ellipsoidal method and CT using intraclass correlation coefficients (ICCs). An expected kidney volume equation was developed using multivariate regression analysis. Manual image segmentation was automated using hybrid learning to calculate the kidney volume. The ICCs for volume determined by image segmentation and ellipsoidal method were significantly different, while that for volume calculated by hybrid learning was significantly higher than that for ellipsoidal method. Volume determined by image segmentation was significantly correlated with weight, body surface area, and height. Expected kidney volume was calculated as (2.22 × weight (kg) + 0.252 × height (cm) + 5.138). This method will be valuable in establishing an age-matched normal kidney growth chart through the accumulation and analysis of large-scale data.

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Noncontrast 3D CMR Imaging for Aortic Valve Annulus Sizing in TAVR

Cited by 24 publications

References 0 publications

CT support of cardiac structural interventions

CT support of cardiac structural interventions

Ferumoxytol MRA for transcatheter aortic valve replacement planning with renal insufficiency

Advanced Kidney Volume Measurement Method Using Ultrasonography with Artificial Intelligence-Based Hybrid Learning in Children

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