Clinical Trial Details
— Status: Recruiting
Administrative data
NCT number |
NCT05764772 |
Other study ID # |
852646 |
Secondary ID |
|
Status |
Recruiting |
Phase |
|
First received |
|
Last updated |
|
Start date |
October 1, 2023 |
Est. completion date |
December 2028 |
Study information
Verified date |
October 2023 |
Source |
University of Pennsylvania |
Contact |
Marisa Sanchez |
Phone |
215-901-9994 |
Email |
Marisa.Sanchez[@]pennmedicine.upenn.edu |
Is FDA regulated |
No |
Health authority |
|
Study type |
Observational [Patient Registry]
|
Clinical Trial Summary
The goal of this observational study is to validate the diagnostic performance of photon
counting/spectral CT to distinguish tissue components in ischemic stroke with
MRI/semi-automated segmentation software and histology as the reference standard.
The main question[s] it aims to answer are:
1. Presence or absence of calcium, hemorrhage, and lipid plaque components as determined on
CT will be confirmed with carotid MRI, segmentation quantitative (e.g., volume) output
from segmentation software, or histologic staining.
2. Volumes of hemorrhage, lipid, and calcium components will be measured to determine
plaque phenotype and correlated with ipsilateral intracranial stroke burden.
Participants will be asked to do the following:
Aim 1:
- 1 Research Carotid/Neck MRI of the carotid arteries
- 1 Photon counting/spectral CT angiography of the neck
Aim 2:
- 1 Research Carotid/Neck MRI of the carotid arteries
- 1 Photon counting/spectral CT angiography of the neck
- 1 Carotid plaque tissue from participants surgery will be retrieved, imaged, and stained
Description:
Independent of the degree of stenosis, specific features of carotid plaque composition are
associated with a high risk of thromboembolic and recurrent stroke. Many lines of evidence
show a significant association between the presence of intraplaque hemorrhage and lipid rich
necrotic core in carotid plaque independent of vessel stenosis in patients with ipsilateral
ischemic infarcts. In fact, up to 17% of ischemic strokes are classified as embolic stroke of
undetermined source (ESUS) after a comprehensive diagnostic work-up. A subset of these
patients have stroke due to mildly stenotic plaque composed of high-risk non-calcified
carotid plaque components that are presently difficult to distinguish by noninvasive
conventional imaging tests. Presently first-line imaging of acute stroke patients is computed
tomography angiography (CTA) of the head and neck. Although conventional CTA provides
information about stenosis, it lacks the ability to distinguish tissue components with
similar attenuation curves (e.g., lipid and intraplaque hemorrhage). Thus, invaluable
diagnostic information is lost due to limitations of conventional CTA. By contrast,
photon-counting/spectral CT is a novel technology that can identify material-specific
characteristics and identify plaque components (e.g., iron/hemorrhage, lipid, and calcium)
based on the specific behavior of these materials at different photon energy levels.
The investigators propose testing the diagnostic performance of this new CT technology to
detect different plaque components in subjects who are medically managed by carotid MRI and
postprocessing PCCT images using a semi-automated carotid plaque segmentation software. The
investigators also propose testing the diagnostic performance of this new CT technology in
patients undergoing carotid endarterectomy revascularization surgery as standard of care with
carotid MRI and histologic validation of the resected plaque tissue (ground truth).
Accurate detection of these high-risk noncalcified plaque components by noninvasive imaging
methods would be of great value to identifying a patient population at highest risk for
embolic stroke from carotid disease.