title: Evaluation of general-purpose collimators against high-resolution collimators with resolution recovery with a view to reducing radiation dose in myocardial perfusion SPECT: A preliminary phantom study.
abstract: There is a growing focus on reducing radiation dose to patients undergoing myocardial perfusion imaging. This preliminary phantom study aims to evaluate the use of general-purpose collimators with resolution recovery (RR) to allow a reduction in patient radiation dose.
  
  
  
  Images of a cardiac torso phantom with inferior and anterior wall defects were acquired on a GE Infinia and Siemens Symbia T6 using both high-resolution and general-purpose collimators. Imaging time, a surrogate for administered activity, was reduced between 35% and 40% with general-purpose collimators to match the counts acquired with high-resolution collimators. Images were reconstructed with RR with and without attenuation correction. Two pixel sizes were also investigated. Defect contrast was measured.
  
  
  
  Defect contrast on general-purpose images was superior or comparable to the high-resolution collimators on both systems despite the reduced imaging time. Infinia general-purpose images required a smaller pixel size to be used to maintain defect contrast, while Symbia T6 general-purpose images did not require a change in pixel size to that used for standard myocardial perfusion SPECT.
  
  
  
  This study suggests that general-purpose collimators with RR offer a potential for substantial dose reductions while providing similar or better image quality to images acquired using high-resolution collimators.
authors.affiliation: Department of Nuclear Medicine, Central Manchester University Hospitals, Oxford Road, Manchester, M13 9WL, United Kingdom. ian.armstrong@cmft.nhs.uk.
authors.forename: Ian S
authors.initials: IS
authors.lastname: Armstrong
authors.affiliation: Department of Nuclear Medicine, Central Manchester University Hospitals, Oxford Road, Manchester, M13 9WL, United Kingdom.
authors.forename: Kimberley J
authors.initials: KJ
authors.lastname: Saint
authors.affiliation: Department of Nuclear Medicine, Central Manchester University Hospitals, Oxford Road, Manchester, M13 9WL, United Kingdom.
authors.forename: Christine M
authors.initials: CM
authors.lastname: Tonge
authors.affiliation: Department of Nuclear Medicine, Central Manchester University Hospitals, Oxford Road, Manchester, M13 9WL, United Kingdom.
authors.forename: Parthiban
authors.initials: P
authors.lastname: Arumugam
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D055414:Myocardial Perfusion Imaging / Q000295:instrumentation*; D019047:Phantoms, Imaging; D010865:Pilot Projects; D011829:Radiation Dosage; D000069079:Radiation Exposure / Q000032:analysis* / Q000517:prevention & control*; D011835:Radiation Protection / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D015899:Tomography, Emission-Computed, Single-Photon / Q000295:instrumentation*
keywords: Myocardial perfusion imaging: SPECT; collimator choice; radiation dose reduction; resolution recovery
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