Reducing Radioisotope Dose: the Half-Dose CZT Study

The recruitment status of this study is unknown because the information has not been verified recently.
Verified January 2012 by The Methodist Hospital System.
Recruitment status was  Not yet recruiting
Information provided by (Responsible Party):
The Methodist Hospital System Identifier:
First received: January 23, 2012
Last updated: January 25, 2012
Last verified: January 2012

January 23, 2012
January 25, 2012
January 2012
December 2014   (final data collection date for primary outcome measure)
Image quality of the half-dose CZT versus full dose scans [ Time Frame: 1 Week ] [ Designated as safety issue: No ]
Same as current
No Changes Posted
  • 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 ]
Same as current
Not Provided
Not Provided
Reducing Radioisotope Dose: the Half-Dose CZT Study
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
This is a pilot study to see whether cardiac imaging can be performed using half the standard dose of radioisotope.

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.

Not Provided
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
Coronary Artery Disease
Radiation: Comparison of the image quality of the half-dose (cadmium zinc telluride) CZT versus full dose scans
Half the standard radioisotope dose used in conventional imaging will be administered to patients undergoing a CZT SPECT over an extended period of time in comparison to patients receiving a standard full radioisotope dose scan performed on a conventional SPECT camera.
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Not yet recruiting
December 2014
December 2014   (final data collection date for primary outcome measure)

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.
18 Years to 90 Years
Contact: Glenda Santua, RN 713-441-3914
United States
Not Provided
Not Provided
The Methodist Hospital System
The Methodist Hospital System
Not Provided
Principal Investigator: John J Mahmarian, MD The Methodist Hospital System
The Methodist Hospital System
January 2012

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP