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SPECT-CT Myocardial Perfusion Imaging

Hybrid nuclear imaging combining SPECT myocardial perfusion with CT attenuation correction and anatomical localization for accurate ischemia assessment.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Radyoloji department. Book Appointment →

What is SPECT-CT Myocardial Perfusion Imaging?

SPECT-CT myocardial perfusion imaging (MPI) integrates single-photon emission CT with low-dose CT for attenuation correction (AC) and coronary calcium scoring. Technetium-99m-based tracers (sestamibi, tetrofosmin) are most commonly used, while thallium-201 retains role in viability assessment. Stress is induced pharmacologically (regadenoson, adenosine, dipyridamole) or with treadmill exercise.

Standard protocol involves rest and stress imaging on 1-day or 2-day basis. Stress imaging uses 8-12 mCi tracer dose with imaging 30-60 minutes post-injection. Modern cadmium-zinc-telluride (CZT) cameras with high-sensitivity allow dose reduction (1-3 mCi) and faster acquisition (5-7 minutes). Gated SPECT provides simultaneous left ventricular function (LVEF, regional wall motion).

CT attenuation correction reduces false-positive findings particularly in obese patients and women with breast attenuation. Coronary calcium scoring on the CT component adds incremental risk information. Indications include suspected CAD, risk stratification, viability assessment, evaluation of myocardial ischemia post-revascularization, and pre-operative cardiac risk assessment. Polar map analysis localizes ischemia to specific coronary territories. Effective dose 6-12 mSv with stress-only protocol reducing dose by 50%.

Symptoms

Test, not a disease — clinical indications:
Symptomatic stable chest pain or angina equivalents
Intermediate-to-high pretest probability of CAD
Risk stratification post-myocardial infarction
Pre-operative cardiac evaluation (intermediate risk surgery)
Assessment of myocardial viability
Detection of ischemia post-revascularization
Equivocal stress ECG or other imaging

Risk Factors

Patient factors limiting study quality:
Severe obesity (>140 kg often technical limit)
Inability to lie still during acquisition
Diaphragmatic or breast attenuation (improved with AC)
Recent myocardial infarction (timing considerations)
Pregnancy (relative contraindication)
Severe asthma/COPD with regadenoson contraindication
Renal failure (limited diuresis)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Stable chest pain with intermediate-high pretest probability
  • Risk stratification after acute coronary syndrome
  • Pre-operative cardiac risk assessment
  • Assessment of viable myocardium pre-revascularization
  • Equivocal exercise stress test
  • Recurrent symptoms after PCI or CABG
  • Heart failure of unclear etiology
  • Cardiomyopathy assessment with ischemia exclusion

Treatment Methods

01
Pharmacological or exercise stress with appropriate agent
02
Tc-99m sestamibi or tetrofosmin tracer injection
03
SPECT acquisition with CT attenuation correction
04
Gated SPECT for LVEF and wall motion analysis
05
Polar map analysis for ischemia localization
06
Coronary calcium scoring on CT component
07
Quantitative perfusion analysis (TID, summed scores)
08
Integration with clinical context for management decisions

Which Department to Visit?

You can visit our Radyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.