Reducing Radioisotope Dose: the Half-Dose CZT Study

This study is currently recruiting participants. (see Contacts and Locations)
Verified March 2016 by The Methodist Hospital System
Information provided by (Responsible Party):
The Methodist Hospital System Identifier:
First received: January 23, 2012
Last updated: March 21, 2016
Last verified: March 2016
This is a pilot study to see whether cardiac imaging can be performed using half the standard dose of radioisotope.

Condition Intervention
Coronary Artery Disease
Other: Half-dose isotope for NuclearStressTest

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
Official Title: Reducing Radioisotope Dose in Regadenoson SPECT Myocardial Perfusion Imaging: Comparison of Half-Dose Scans Using a Novel Solid-State-Detector Dedicated Cardiac Camera to Full Dose Scans Acquired On Standard Equipment

Resource links provided by NLM:

Further study details as provided by The Methodist Hospital System:

Primary Outcome Measures:
  • Image quality of the half-dose CZT versus full dose scans [ Time Frame: 1 Week ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Total radiation dose/exposure of the half-dose CZT vs. full dose scans [ Time Frame: 1 Week ] [ Designated as safety issue: Yes ]
  • Total myocardial count activity and count rates obtained during each scan [ Time Frame: 1 Week ] [ Designated as safety issue: No ]
  • Agreement between the half-dose CZT vs. full dose scans on the presence and extent of fixed or reversible defects on a per-patient and vessel basis [ Time Frame: 1 Week ] [ Designated as safety issue: No ]
  • Agreement between the half-dose vs. full dose scans on gated data such as EF, left ventricular (LV) end-diastolic volume, LV end-systolic volume [ Time Frame: 1 Week ] [ Designated as safety issue: No ]

Estimated Enrollment: 200
Study Start Date: January 2012
Estimated Study Completion Date: July 2016
Estimated Primary Completion Date: May 2016 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Half-dose isotope for NuclearStressTest
Intervention is Nuclear stress test of the heart. Single-arm of this study "Half-dose of isotope for Nuclear stress test" is group of study subjects who will do Research Nuclear stress test with half-dose of isotope that normally used for routine Nuclear stress test. Isotope is the tracer CZT (cadmium zinc telluride) that used for Nuclear stress test routinely to see the function of arteries of the heart. Patients with suspected Coronary Artery Disease who meet entry criteria undergo a research nuclear stress test using a decreased dose of isotope, using a new camera.
Other: Half-dose isotope for NuclearStressTest
Half-dose of tracer or radioisotope will be used for Nuclear stress test of the heart. This is imaging test of the heart to see the function of arteries of the heart.
Other Name: SPECT using CZT

Detailed Description:

The aim of this study is to compare the image quality of the half radioisotope dose scans obtained using a CZT (cadmium zinc telluride) camera with scans acquired using a standard of care imaging protocol/radioisotope dose performed on a traditional (conventional) camera.

The proposed strategy of a half dose/extended time protocol with the CZT camera should yield a similar count activity and consequently image quality equivalent to that detected by a conventional SPECT system.


Ages Eligible for Study:   18 Years to 90 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • ≥ 18 years of age and referred for a clinically-indicated stress SPECT MPI study
  • suspected or known coronary artery disease
  • written informed consent

Exclusion Criteria:

  • Evidence of a normal baseline scan after at least 50% of the protocol acquired baseline scans have been interpreted as being normal
  • Participation in another investigational study within the preceding month
  • Pregnant and/or breast-feeding female
  • ECG evidence of left bundle branch block or paced rhythm
  • Evidence of non-ischemic cardiomyopathy
  • Presence of hypertrophic cardiomyopathy and/or severe valvular heart disease
  • Severe claustrophobia or inability to lie flat for 20 minutes (the anticipated amount of time to complete the procedure)
  • Known allergy to technetium-99m
  • Potential contraindications to regadenoson use, due to severe lung disease; severe bradycardia (heart rate < 40 beats/min); second- or third degree atrioventricular heart block; sick sinus syndrome; long QT syndrome; severe hypotension; or decompensated heart failure.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01518777

Contact: Tatiana Belousova, MD 713-441-6536

United States, Texas
Houston Methodist Hospital Recruiting
Houston, Texas, United States, 77030
Contact: Tatiana Belousova, MD    713-441-3914   
Principal Investigator: Su Min Chang, MD         
Sub-Investigator: Faisal Nabi, MD         
Sponsors and Collaborators
The Methodist Hospital System
Principal Investigator: Su Min Chang, MD The Methodist Hospital System
  More Information


Responsible Party: The Methodist Hospital System Identifier: NCT01518777     History of Changes
Other Study ID Numbers: Pro00006818 
Study First Received: January 23, 2012
Last Updated: March 21, 2016
Health Authority: United States: Institutional Review Board

Keywords provided by The Methodist Hospital System:
Coronary Artery Disease

Additional relevant MeSH terms:
Coronary Artery Disease
Coronary Disease
Myocardial Ischemia
Arterial Occlusive Diseases
Cardiovascular Diseases
Heart Diseases
Vascular Diseases processed this record on May 25, 2016