Attenuation Corrected Cardiac SPECT Using the GE Hawkeye Camera System (Hawkeye)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00587730
Recruitment Status : Terminated (Recruiting or enrolling participants has halted prematurely and will not resume.)
First Posted : January 7, 2008
Last Update Posted : April 23, 2015
Information provided by:
Mayo Clinic

Brief Summary:
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).

Condition or disease Intervention/treatment Phase
Cardiac Disease Device: GE Attenuation Corrected Hawkeye Camera Phase 2 Phase 3

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 608 participants
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Attenuation Corrected Cardiac SPECT Using the GE Hawkeye Camera System
Study Start Date : July 2001
Actual Primary Completion Date : August 2004
Actual Study Completion Date : August 2004

Arm Intervention/treatment
Active Comparator: Clinical SPECT
GE Hawkeye Attenuation Correction Camera is being compared to the approved clinical use SPECT camera.
Device: GE Attenuation Corrected Hawkeye Camera
GE Hawkeye AC system and 360˚ camera orbit

Primary Outcome Measures :
  1. The overall comparisons of the agreement between conventional SPECT imaging and the GE Hawkeye system will be completed using McNemar's test. [ Time Frame: Measured/Compared at time of each scan. ]

Secondary Outcome Measures :
  1. Comparisons of categorical factors between the 2 tests will also be completed using McNemar's test, continuous factors will be completed using a paired t-test if the differences are normally distributed. [ Time Frame: Measured/Compared at time of study ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

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

Exclusion criteria:

  • 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

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00587730

United States, Minnesota
Mayo Clinic
Rochester, Minnesota, United States, 55905
Sponsors and Collaborators
Mayo Clinic
Principal Investigator: Todd D Miller, MD Mayo Clinic

Responsible Party: Todd D. Miller, MD/Professor of Medicine, Mayo Clinic Identifier: NCT00587730     History of Changes
Other Study ID Numbers: 1042-01
First Posted: January 7, 2008    Key Record Dates
Last Update Posted: April 23, 2015
Last Verified: April 2015

Keywords provided by Mayo Clinic:
heart disease
cardiac disease
chest pain
myocardial infarction
heart attack

Additional relevant MeSH terms:
Heart Diseases
Cardiovascular Diseases