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Drivers of radiation dose reduction with myocardial perfusion imaging: A large health system experience

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Journal of Nuclear Cardiology Aims and scope

Abstract

Background

Despite increasing emphasis on reducing radiation exposure from myocardial perfusion imaging (MPI), the use of radiation-sparing practices (RSP) at nuclear laboratories remains limited. Defining real-world impact of RSPs on effective radiation dose (E) can potentially further motivate their adoption.

Methods

MPI studies performed between 1/2010 and 12/2016 within a single health system were included. Mean E was compared between sites with ‘basic’ RSP (defined as elimination of thallium-based protocols and use of stress-only (SO) imaging on conventional single photon emission computed tomography (SPECT) cameras) and those with ‘advanced’ capabilities (sites that additionally used solid-state detector (SSD) SPECT cameras, advanced post-processing software (APPS) or positron emission tomography (PET) imaging), after matching patients by age, gender, and weight. Contributions of individual RSP to E reduction were determined using multiple linear regression after adjusting for factors affecting tracer dose.

Results

Among 55,930 MPI studies performed, the use of advanced RSP was associated with significantly lower mean E compared to basic RSP (7 ± 5.6 mSv and 16 ± 5.4 mSv, respectively; P < 0.001), with a greater likelihood of achieving E < 9 mSv (65.7% vs. 10.8%, respectively; OR 15.8 [95% CI 14 to 17.8]; P < 0.0001). Main driver of E reduction was SO-SSD SPECT (mean reduction = 11.5 mSv), followed by use of SO-SPECT + APPS (mean reduction = 10.1 mSv), ;ET (mean reduction = 9.7 mSv); and elimination of thallium protocols (mean reduction = 9.1 mSv); P < 0.0001 for all comparisons.

Conclusion

In a natural experiment with implementation of radiation-saving practices at a large health system, stress-only protocols used in conjunction with modern SPECT technologies, the use of PET and elimination of thallium-based protocols were associated with greatest reductions in radiation dose. Availability of several approaches to dose reduction within a health system can facilitate achievement of targeted radiation benchmarks in a greater number of performed studies.

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Abbreviations

CAD:

Coronary artery disease

E :

Effective dose

MPI:

Myocardial perfusion imaging

PET:

Positron emission tomography

RSP:

Radiation-sparing practices

SO:

Stress-only

SPECT:

Single photon emission computed tomography

SSD:

Solid-state detector

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Disclosures

Drs. Patel and Al Badarin are supported by the National Heart, Lung, And Blood Institute of the National Institutes of Health under Award Number T32HL110837. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. Dr. Spertus receives research grant support from Abbott Vascular, Novartis, and is the PI of an analytic center for the American College of Cardiology. He serves as a consultant to the United Healthcare, Bayer, Janssen, AstraZeneca, and Novartis. He has an equity interest in the Health Outcomes Sciences. Dr. Bateman receives research grant support from Astellas and GE Healthcare. He serves as a consultant to GE Healthcare. He has ownership interest in Cardiovascular Imaging Technologies. He has intellectual property rights for Imagen Pro/MD/Q/3D software. The other authors have no conflicts of interest to disclose.

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Correspondence to Firas J. Al Badarin MD.

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Al Badarin, F.J., Spertus, J.A., Bateman, T.M. et al. Drivers of radiation dose reduction with myocardial perfusion imaging: A large health system experience. J. Nucl. Cardiol. 27, 785–794 (2020). https://doi.org/10.1007/s12350-018-01576-w

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