With a coronary calcium score of 1440, will computed tomography angiography (CTA) show a blooming artifact that could affect the test results?

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Last updated: October 4, 2026 • View editorial policy

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Yes, with a calcium score of 1440, CTA will have significant blooming artifacts that can substantially affect test accuracy and interpretation.

With such extensive coronary calcification (calcium score of 1440), coronary CTA is generally not recommended as the blooming artifacts will likely lead to overestimation of stenosis severity and may render segments non-diagnostic. 1

Understanding the Problem

A calcium score of 1440 represents severe/extensive coronary calcification. This creates a fundamental technical limitation for CTA imaging:

Why Blooming Occurs

  • Limited spatial resolution of CT scanners causes calcium to appear larger than its actual size 2
  • The high-density calcium (>130 Hounsfield units) creates beam hardening artifacts that obscure the adjacent contrast-filled lumen 3
  • This "blooming effect" makes it impossible to accurately assess the true degree of stenosis 4

Clinical Impact at Your Calcium Score Level

Guideline-based contraindication: Both the 2019 ESC and 2012 ACC/AHA guidelines explicitly state that coronary CTA is not recommended when extensive coronary calcification is present because:

  • Severe calcifications lead to overestimation of stenosis severity 1
  • The accuracy of CTA is frequently impaired by blooming artifacts 1
  • This can result in false positive studies 5

The decision must be made on an individual basis, considering:

  • Overall image quality expectations
  • Distribution of calcium throughout the coronary tree
  • Whether specific segments are likely to remain evaluable 1

What This Means for You

Diagnostic Accuracy Concerns

  • Calcified plaque is the most common source of artifacts in CTA (14.4% of studies) 3
  • With a calcium score >1000, expect significant limitations in lumen visualization 2
  • Recent research confirms calcium burden affects quantification of lumen dimensions and plaque characterization 4

Alternative Testing Recommended

Instead of CTA, consider:

  • Functional stress testing (nuclear perfusion, stress echo, stress CMR) to assess for ischemia 1
  • Invasive coronary angiography if high clinical suspicion for obstructive disease
  • Hybrid imaging approaches (SPECT/CT, PET/CT) that combine anatomy with physiology 5

Important Caveats

If CTA is still performed despite the high calcium score:

  • Expect segments to be called "non-diagnostic" due to calcium 6, 7
  • Stenosis severity will likely be overestimated 1
  • Newer high-resolution CT systems with advanced reconstruction techniques may reduce (but not eliminate) blooming 8
  • Expert interpretation is critical to avoid misclassification 1

Clinical bottom line: Your calcium score of 1440 places you in the category where CTA has poor specificity and may provide misleading information about stenosis severity. Functional testing or direct invasive angiography (if clinically indicated) would provide more reliable information for guiding management decisions that affect your cardiovascular outcomes.

References

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