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Variability in Heart-to-Mediastinum Ratio from Planar 123I-MIBG Images of a Thorax Phantom for 6 Common γ-Camera Models
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- Owenius, Rikard (author)
- Uppsala universitet,Radiologi
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- Zanette, Michelle (author)
- GE Healthcare, Life Sci, Imaging R&D, Marlborough, MA USA.
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- Cella, Patrick (author)
- GE Healthcare, Life Sci, Imaging R&D, Marlborough, MA USA.
- (creator_code:org_t)
- 2017-10-17
- 2017
- English.
- In: Journal of Nuclear Medicine Technology. - : Society of Nuclear Medicine. - 0091-4916 .- 1535-5675. ; 45:4, s. 297-303
- Journal article (peer-reviewed)
Abstract
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- A heart-to-mediastinum (H/M) ratio of 1.6 or greater on planar I-123-iobenguane (I-123-MIBG) images identifies heart failure patients at low risk of experiencing an adverse cardiac event. This phase-4 study used standardized phantoms to assess the intercamera, intracamera, and interhead variability in H/M ratio determinations from planar cardiac I-123-MIBG imaging using commercially available, dual-head.-cameras. Methods: A fillable thorax phantom was developed to simulate the typical uptake of I-123-MIBG. The phantom had a nominal H/M ratio of 1.6 on the reference camera. Commercial cameras used in the study were dual-head and capable of 90 degrees configuration for cardiac imaging. The target sample size was 8 units (examples) per camera model. Two imaging technologists independently analyzed planar images of simulated I-123-MIBG uptake from the thorax phantom. H/M was the ratio of the average counts per pixel of the heart and mediastinum regions of interest. The primary endpoint, intercamera variability in H/M ratio from head 1, was determined for each camera model via comparison with the H/M ratio on the reference camera. Only cameras with at least 8 units tested (n >= 8) were included in the primary analysis. Intracamera and interhead variability in the H/M ratio were also evaluated. Results: Nine camera models were studied. The mean H/M ratio ranged from 1.342 to 1.677. The primary analysis (6 camera models) using a mixed-model, repeated-measures analysis showed no significant difference in H/M ratio between any camera model and the reference camera. Intracamera variability (head 1) in the H/M ratio among camera models with 8 units or more was high, with SDs ranging from 0.0455 to 0.1193. Interhead variability was low (SDs of the interhead difference, 0.017-0.074). Conclusion: Commonly used.-cameras produced H/M ratios from simulated I-123-MIBG phantom images that were not significantly different from those on the reference camera. This finding indicates that the results of previous clinical trials of I-123-MIBG, involving many different clinical sites and camera models, are valid. The assessment of the performance of a given camera unit using an I-123 planar phantom before H/M results from I-123-MIBG imaging are used for classifying risk in heart failure patients is encouraged.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
Keyword
- iobenguane
- MIBG
- phantom
- heart-to-mediastinum ratio
- heart failure
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- ref (subject category)
- art (subject category)
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