D-SPECT Camera’s MPI Dose Reduction Capability Yields a Significant Decrease in Radiation Exposure

The need to reduce radiation exposure to patients and medical personnel has always been Spectrum’s goal since its introduction of the D-SPECT. This next generation solid-state-digital detector technology has the unique capability to count up to 10X the speed of a conventional Anger camera thus drastically reducing imaging time (2-minute Gated SPECT study) or one can significantly reduce the injected dose and acquire slightly longer (6-10 minutes).

“Back in 2008, prior to the Tc-99m supply disruption announcement, many of our sites had already recognized this unique capability and begun decreasing doses to reduce exposure to their patients and staff. We had sites using as little as 5 mCi of Tc99m and getting exceptional image quality with a 6-8 minute Gated Spect scan,” says Josh Gurewitz, VP of Sales and Marketing. Further, based on the medical community’s concern over the level of radiation patients receive from myocardial perfusion studies, Spectrum is working with several major research sites to develop and validate two new ultra low dose Tc-99m protocols - a stress only and a stress and rest. These projects are now completed and publications are underway. These protocols use significantly less Tc-99m and/or Tl-201 than conventional gamma cameras while maintaining excellent image quality, even with morbidly obese patients. This in turn not only reduces the radiation dose to the patient, but the medical staff as well and provides the ability to perform more studies in a single day.

Also important to note is Spectrum’s approach to Ultra Low Dose* imaging is different. Our ability to start with a count rich data set prior to reconstruction is due to the D-SPECT’s 9 high sensitivity detectors focused on the myocardium thus improving the target to background ratio. Coupled with the proprietary acquisition software, it automatically calculates the optimal time required to ensure consistent image quality with ultra low dose imaging. Other approaches that work with conventional gamma cameras start with lower count densities before applying the software enhancements. Our proprietary reconstruction package uses resolution recovery for improved image quality as well. These are critical components to our approach, as adoption of ultra low dose imaging will require consistently high image quality, amongst all patient sizes,” Gurewitz added.


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