Attenuation Corrected Cardiac SPECT Using the GE Hawkeye Camera System

Stopped early · Phase 2/Phase 3

Conditions studied: Cardiac Disease

In brief

The accuracy of stress single photon emission computed tomography (SPECT) is limited by imaging artifacts, many of which are caused by soft tissue attenuation. A recent multicenter study performed by our laboratory comparing 7 commercially available attenuation correction (AC) camera systems in a cardiac phantom showed the best performance with the GE Hawkeye (a hybrid gamma camera-CT scanner) and the University of Michigan M-step (unique feature a camera orbit of 360˚ versus the usual 180˚) systems. In this study we will combine the strengths of these two systems (GE Hawkeye AC system and 360˚ camera orbit) to test the accuracy of this imaging system in a population of 400 consecutive patients undergoing clinically indicated stress SPECT. These patients will undergo SPECT imaging both with conventional methodology and the GE Hawkeye system. The conventional study will be interpreted and reported in the usual clinical fashion. The GE Hawkeye images will be interpreted independently by 2 observers blinded to the results of conventional imaging and will not be reported clinically. The primary study hypothesis is that AC will substantially reduce attenuation artifacts (mild fixed defects) without reducing the accuracy of either normal studies or myocardial infarction (MI). Clinical data and noninvasive test results (history of MI, electrocardiogram, and gated wall motion) will be used to distinguish defects which represent attenuation (false-positive) versus those due to MI (true-positive).

Key facts

Study ID

NCT00587730

Run by

Mayo Clinic

People needed

608

Starts

2001-07-01

Expected to finish

2004-08-01

Last updated by the study team

2015-04-23

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Patients referred to the Charlton Nuclear Cardiology Laboratory for stress Tc-99m sestamibi SPECT

You may not qualify if…

• Prior PTCA or CABG
• Left bundle branch block (LBBB) or paced ventricular rhythm
• Clinically significant valvular heart disease
• Hypertrophic or idiopathic dilated cardiomyopathy
• Atrial fibrillation or frequent atrial or ventricular ectopy (defined as >20% ectopic beats
• History of MI
• ECG evidence of MI
• Chest circumference >55 inches

Where it is running

• Mayo Clinic — Rochester, Minnesota, United States

Full record on ClinicalTrials.gov

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