Aorta wall motion monitoring by 1-d MRI of perpendicular diameters

Dynamic geometry and wall thickness of the aortic neck of abdominal aortic aneurysms with intravascular ultrasonography

“…It is well established that arterial wall biomechanics (ie, wall motion, wall stress, and wall thickness) contribute to the localization of atherosclerotic plaques and aneurysm development/progression. [1][2][3][4][5] Hemodynamic factors have been linked to the localization of atherosclerotic plaque formation in areas of low shear stress and shear separation in the carotid, aortic, femoral, and coronary arteries. 6 Furthermore, the elastic properties of the aortic wall permit deformation of the aorta with pulsatile blood flow: ie, the aorta relaxes during diastole and expands during systole.…”

“…However, a review of recent literature provides evidence to the contrary, suggesting an unequal circumferential deformation of the aorta during the cardiac cycle. [1][2][3][4][5] Because successful aneurysm exclusion is dependent on a complete seal at the level of the infrarenal aortic neck, uneven aortic wall motion and variable cyclic strain at this location could result in intermittent or constant pressurization of the aneurysmal sac (endotension), aneurysmal enlargement, and endoleak. 1 Contrast-enhanced computed tomographic angiography (CTA) is the most commonly used imaging modality for preoperative assessment of aortic aneurysm size and aortic neck dimensions for endograft sizing.…”

Manganese‐enhanced MRI of mouse heart during changes in inotropy†

“…There has been rapid development in functional cardiac MRI techniques. MRI can be used to assess anatomy as a function of cardiac cycle (1), regional blood flow using contrast agents (2) or endogenous arterial spin labeling techniques (3), and regional wall motion using phase‐sensitive (4, 5) or tagging techniques (6). In addition to MRI, spectroscopic techniques, including 31 P, 13 C, and 23 Na, offer a means to measure metabolic changes associated with changes in cardiac function (7).…”

In vitro validation of MR measurements of arterial pulse‐wave velocity in the presence of reflected waves

“…Direct measurements of vascular compliance require an estimate of the change in vessel area resulting from a given change in intravascular pressure. Such measurements have been made using ultrasounds (3), x‐ray computed tomography (4), and magnetic resonance imaging (MRI) (5, 6), generally coupled with invasive micro‐catheter pressure measurements, or estimates based on the peripheral blood pressure. Vessel compliance can also be determined by means of wave velocity measurements.…”