Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 2 de 2
Filter
Add more filters










Database
Language
Publication year range
1.
J Nucl Cardiol ; 28(1): 225-233, 2021 02.
Article in English | MEDLINE | ID: mdl-30834500

ABSTRACT

BACKGROUND: In addition to acquired photon counts, image noise depends on the image reconstruction algorithm. This work develops patient-specific activity or acquisition time protocols to standardize the average noise in a reconstructed image for different patients, cameras, and reconstruction algorithms. METHODS: Image noise was calculated for images from 43 patients acquired on both a conventional and a multiple-pinhole cardiac SPECT camera. Functions were found to relate image noise to radiotracer activity, scan time, and body mass and were validated by normalizing the image noise in a test set of 58 patients. RESULTS: There was a 3.6-fold difference in photon sensitivity between the two cameras but a 16-fold difference in activity-scan time was necessary to match the noise levels. Image noise doubled from 45 to 128 kg for the conventional camera (12.8 minutes) and tripled for the multiple-pinhole camera (5 minutes) for 350 MBq (9.5 mCi) 99mTc-tetrofosmin. It was 16.3% and 6.1% respectively for an average sized patient. CONCLUSIONS: A linear scaling of activity with respect to the patient weight normalizes image noise but the scaling factors depend on the choice of camera and image reconstruction parameters. Therefore, equivalent numbers of acquired photon counts are not sufficient to guarantee equivalent image noise.


Subject(s)
Gamma Cameras , Heart/diagnostic imaging , Image Processing, Computer-Assisted , Myocardial Perfusion Imaging , Tomography, Emission-Computed, Single-Photon , Adult , Aged , Aged, 80 and over , Algorithms , Artifacts , Body Weight , Clinical Protocols , Female , Humans , Male , Middle Aged , Radiopharmaceuticals , Reference Values , Retrospective Studies , Sensitivity and Specificity , Time Factors
2.
J Nucl Cardiol ; 27(4): 1382, 2020 Aug.
Article in English | MEDLINE | ID: mdl-30919274

ABSTRACT

The originally published version of this article contained typographical errors in the units of photon sensitivity. The units of counts · MBq-1 · min-1 and kcounts · mCi-1 · min-1 were mistakenly recorded as counts · MBq · min and kcounts · mCi · min respectively. The original article has been corrected.

SELECTION OF CITATIONS
SEARCH DETAIL
...