Advances in determining abdominal aortic aneurysm size and growth

Kontopodis, Nikolaos; Lioudaki, Stella; Pantidis, Dimitrios; Papadopoulos, George; Georgakarakos, Efstratios; Ioannou, Christos

doi:10.4329/wjr.v8.i2.148

Cited by 23 publications

(20 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The use of volume measurements in addition to diameter measurements for detection of aneurysm growth has been a topic of interest in multiple vascular territories. Literature on abdominal aortic aneurysms showed that volumetric measurements may be superior to conventional diameter measurements for detecting size changes as a follow-up tool after endovascular repair 14,15 , as well as untreated aneurysm surveillance 16 . In intracranial aneurysms, a moderate correlation of volume and diameter at best was only found in predominantly saccularly shaped aneurysms, and not at all in fusiform aneurysms 17 .…”

Section: Discussionmentioning

confidence: 99%

Volumetric assessment of extracranial carotid artery aneurysms

Vries

Laarhoven

Kuijf

et al. 2019

Sci Rep

View full text Add to dashboard Cite

The extracranial carotid artery aneurysm (ECAA) is a rare pathology for which clinical treatment guidelines are lacking. In general, symptoms or growth of the aneurysm sac are thought to indicate intervention. ECAAs may present in a large variety of shapes and sizes, and conventional diameter measurements fail to indicate geometrical differences. Therefore, we propose a protocol to measure ECAA size by 3D volumetric assessment. The volumes of 40 ECAAs in computed tomography angiography (CTA) images were measured through manual segmentation, by two independent operators. Volumes of the entire internal carotid artery (ICA) and the ECAA were measured separately. Excellent inter- and intraoperator reliability was found for both ICA and ECAA volumes, with all intraclass correlation coefficients above 0.94. Bland-Altman analysis revealed normal differences for both inter- and intraoperator agreement. For all volumes, similarity of the segmentations was excellent. Outliers were explained by presence of intraluminal ECAA thrombus, which hampered identification of the aneurysm outer wall. These results implicate robustness of our protocol, which is designed as a step-up towards (semi)automatic volumetric measurements to monitor patients with ECAA. Future (semi)automatic volumetric assessments are recommended and such techniques can be developed and validated using the proposed protocol and manual reference segmentations.

show abstract

Section: Discussionmentioning

confidence: 99%

Volumetric assessment of extracranial carotid artery aneurysms

Vries

Laarhoven

Kuijf

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The reason why the 3D method overestimates the volume of polymer is unknown, few studies have discussed the tendency of 3D CT reconstruction to overestimates the size of the aortic aneurysm sac [ 4 ]. It might also be related to the characteristics of the polymer material.…”

Section: Discussionmentioning

confidence: 99%

A Comparison of Manual and Three-Dimensional Modalities in Predicting Nellix Polymer Volume

Elbasty

Mughal

Delbridge

2018

VSI

View full text Add to dashboard Cite

PurposeAchieving an effective seal with the Nellix endovascular aneurysm system is dependent on filling the stent bags with an appropriate volume of polymer. Calculating this volume preoperatively is essential and can be performed manually or using three-dimensional (3D) software. The aim of this project was to compare the accuracy of these two methods relative to the actual polymer volume used.Materials and MethodsConsecutive patients undergoing Nellix aneurysm repair were included in this retrospective study. Operation notes were analysed for the polymer volume used intra-operatively. Predicted volumes for all patients had been calculated on picture archiving and communication system (PACS) using a manual ‘segmental cylinder’ method. Computed tomography angiograms were then re-analysed using the Synapse 3D PACS update. The difference between groups was assessed using a paired t-test.ResultsTwenty-eight patients were included in the analysis; 26 men (92.9%) and 2 women (7.1%); median age 80.9 years (interquartile range, 72.5–84.5 years). The mean volume of polymer used was 103 mL. The mean manual-derived prediction was 100.1 mL (P=0.365) and 3D-derived prediction 110.2 mL (P<0.001). Manual prediction led to an average 2.8% underestimate of polymer volume whilst 3D prediction led to an average 7.0% overestimate.ConclusionCalculating predicted polymer volume for the Nellix system is more accurate using a manual approach then the 3D alternative. Whilst this method is more time-consuming, there is no significant difference when compared to the actual volume used. Quicker 3D software predictions can be utilised, but their tendency to overestimate should be recognized and taken into account during planning.

show abstract

“…3D reconstruction volume measurements have been documented as a reliable method for tracking abdominal aorta aneurysmal (AAA) growth and tumor necrosis quantification (15, 23). Multiple studies have demonstrated volume measurements are more sensitive to abdominal aortic aneurysm growth change since maximal diameters do not always change with aortic dilatation (24–26).…”

Section: Discussionmentioning

confidence: 99%

“…Multiple studies have demonstrated volume measurements are more sensitive to abdominal aortic aneurysm growth change since maximal diameters do not always change with aortic dilatation (24–26). Kontopodis et al showed 3D reconstructions from CT scans are more predictive than 2D measurements for determining need for surgical intervention in patients with AAA (23). Uribe et al demonstrated 3D cardiac ventricular volume calculations at MR had less intra- and inter-observer variability than traditional 2D measurements (27).…”

Section: Discussionmentioning

confidence: 99%

Aortic Volumetry at Contrast-Enhanced Magnetic Resonance Angiography

Trinh¹,

Dubin²,

Rahman³

et al. 2017

Invest Radiol

View full text Add to dashboard Cite

1.1. Objectives Bicuspid aortic valve (BAV) patients can develop thoracic aortic aneurysms (TAA) and therefore require serial imaging to monitor aortic growth. This study investigates the reliability of contrast-enhanced MR angiography (CEMRA) volumetry compared to two-dimensional diameter measurements to identify TAA growth. 1.2. Materials and Methods A retrospective, IRB approved and HIPAA compliant study was conducted on 20 BAV patients (45±8.9 years old, 20% women) who underwent serial CEMRA with a minimum imaging follow-up of 11 months. MRI was performed at 1.5 T with ECG-gated time-resolved CEMRA. Independent observers measured the diameter at the sinuses of Valsalva (SOV) and mid-ascending aorta (MAA) as well as ascending aorta volume between the aortic valve annulus and innominate branch. Intra/inter-observer coefficient of variation (COV) and intraclass correlation coefficient (ICC) were computed to assess reliability. Growth rates were calculated and assessed by Student’s t-test (p<0.05 significant). The diameter of maximal growth (DMG), defined as the diameter at SOV or MAA with the faster growth rate, was recorded. 1.3. Results The mean time of follow-up was 2.6±0.82 years (y). The intraobserver COV was 0.01 for SOV, 0.02 for MAA, and 0.02 for volume (interoberserver COV: 0.02, 0.03, 0.04, respectively). The ICC was 0.83 for SOV, 0.86 for MAA, 0.90 for DMG, and 0.95 for volume. Average aortic measurements at baseline and (follow-up) were 42±3 mm (42±3 mm, p=0.11) at SOV, 46±4 mm (47±4 mm, p<0.05) at MAA, and 130±23 mL (144±24 mL, p<0.05). Average size changes were 0.2±0.6 mm/y (1%±2%) at SOV, 0.5±0.8 mm/y (1%±2%) at MAA, 0.7±0.7 mm/y (2%±2%) at DMG, and 6±3 mL/y (4%±3%) with volumetry. 1.4. Conclusions 3D CEMRA volumetry exhibited a larger effect when examining percentage growth, a better ICC, and a marginally lower COV. Volumetry may be more sensitive to growth and possibly less affected by error than diameter measurements.

show abstract

Advances in determining abdominal aortic aneurysm size and growth

Cited by 23 publications

References 50 publications

Volumetric assessment of extracranial carotid artery aneurysms

Volumetric assessment of extracranial carotid artery aneurysms

A Comparison of Manual and Three-Dimensional Modalities in Predicting Nellix Polymer Volume

Aortic Volumetry at Contrast-Enhanced Magnetic Resonance Angiography

Contact Info

Product

Resources

About