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August 22, 2026Journal of Thoracic Imaging

Diagnostic Value of Calcium Score Derived From Virtual Noncontrast, Non–ECG-gated Dual-energy CT as an Indicator of Severe Aortic Stenosis

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Why the study?

To estimate the probability of severe aortic stenosis by calculating the aortic valve calcium score using virtual noncontrast reconstructions derived from non-ECG-gated dual-energy CT scans.

Does aortic valve calcium score derived from virtual noncontrast non-ECG-gated DECT accurately identify severe aortic stenosis in patients scanned for noncardiac indications?

Population

59 patients with visible aortic valve calcifications on non-ECG-gated DECT scans for noncardiac indications

Comparison

AVCS on VNC reconstructions vs echocardiogram-determined degree of aortic stenosis

Design

Retrospective monocentric study

Key result

Aortic valve calcium score derived from virtual noncontrast DECT demonstrated good diagnostic performance in distinguishing severe from nonsevere aortic stenosis (AUC=0.91 in women, 0.95 in men).

Authors

JBJakub ByczkowskiUniversity of Milano-BicoccaGCGregorio ChierchiaOspedale Papa Giovanni XXIIIGMGiuseppe MuscogiuriOspedale Papa Giovanni XXIII

Discussion

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Member takes

Overview

May enable incidental severe AS detection on noncardiac DECT; hypothesis-generating pending prospective validation.

Key Points

  • To evaluate the diagnostic accuracy of aortic valve calcium scores derived from virtual noncontrast, non-ECG-gated dual-energy CT in detecting severe aortic stenosis.
  • Retrospectively analyzed 59 patients who underwent non-ECG-gated dual-energy CT scans for noncardiac indications and presented with visible aortic valve calcifications.
  • Calculated aortic valve calcium scores on virtual noncontrast reconstructions using semiautomatic software and compared values to echocardiograms performed within 12 months.
  • Patients with severe aortic stenosis had a significantly higher mean calcium score (919.2 ± 1262.4 AU) compared to those with nonsevere stenosis (127.9 ± 278.6 AU).
  • Calcium scoring effectively differentiated severe from nonsevere stenosis in females (AUC = 0.91) and males (AUC = 0.95), but lacked statistical significance when discriminating between severe and moderate stenosis (AUC = 0.714, P = 0.1325).

Study Design

Type

Observational (n=59)

Multicenter

No

Structured PICO

Does aortic valve calcium score derived from virtual noncontrast non-ECG-gated DECT accurately identify severe aortic stenosis in patients scanned for noncardiac indications?

P
Population
59 patients with visible aortic valve calcifications who underwent DECT scans for noncardiac indications and had an echocardiogram within 12 months.
E
Exposure
Aortic valve calcium score (AVCS) calculation using virtual noncontrast (VNC) reconstructions derived from non-ECG-gated DECT scans
C
Comparator
Echocardiogram (reference standard for degree of aortic stenosis)
O
Outcome
Diagnostic performance (AUC) of AVCS in distinguishing between severe and nonsevere aortic stenosissurrogate

Main Result

Effect estimate: AUC 0.926

Aortic valve calcium scoring derived opportunistically from non-ECG-gated DECT scans for noncardiac indications can accurately identify severe aortic stenosis.

Cite This Study

Byczkowski et al. (2026) conducted an observational in Aortic stenosis (n=59). Aortic valve calcium score (AVCS) from virtual noncontrast DECT was evaluated on Distinguishing between severe and nonsevere aortic stenosis (AUC 0.926). Aortic valve calcium score derived from virtual noncontrast DECT demonstrated good diagnostic performance in distinguishing severe from nonsevere aortic stenosis (AUC=0.91 in women, 0.95 in men).

synapsesocial.com/papers/6a895ffeca7ade938187efeehttps://doi.org/10.1097/rti.0000000000000904
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