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Thyroid Cancer Diagnosis and Treatment / Advanced X-ray and Ct Imaging · Journal article
BMC Medical Imaging · August 8, 2026
Encouraging direction, but not yet definitive.
This secondary analysis of 35 patients with differentiated thyroid cancer found that post-therapeutic radioiodine whole-body scintigraphy acquired at 24 hours provided significantly superior image quality and interpretability compared to 6, 72, and 168 hours, with 48 hours showing a non-significant trend toward equivalence. The finding is based on expert-rated surrogate imaging endpoints rather than clinical outcomes, and generalizability to high-risk disease and diverse clinical settings is uncertain.
Retrospective secondary analysis of prospectively acquired imaging data with structured expert assessment. 35 patients with predominantly low- and intermediate-risk differentiated thyroid cancer undergoing radioiodine therapy. Intervention: Post-therapeutic [131I]NaI whole-body scintigraphy at 24 hours post-radioiodine therapy. Compared with: Scans acquired at 6, 48, 72, and 168 hours post-radioiodine therapy. n = 35. Not stated.
24-h acquisition had highest estimated preference in Plackett-Luce model ranking, favored over 6 h, 72 h, and 168 h (P < 0.05 after Holm adjustment) Criteria-based quality score highest at 24 h (39.52; 95% CI, 38.62–40.43) versus 48 h (34.79) Difference between 24 h and 48 h not statistically significant (P = 0.091)
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
Clinicians should consider 24-hour acquisition as the preferred timing for post-therapeutic radioiodine whole-body scintigraphy based on image quality, though 48-hour acquisition may be a practical alternative when justified by operational or radiation-protection factors. The evidence is limited to imaging quality endpoints and a small cohort; clinical outcomes and applicability to high-risk disease remain unstudied.
A well-designed secondary analysis of prospectively acquired imaging data with independent expert assessment and rigorous statistical methods, but limited to a single-centre cohort of 35 patients evaluating a surrogate imaging quality endpoint rather than clinical outcomes.
As stated by the source record.
Quoted from the source exactly as published.
Clinicians should consider 24-hour acquisition as the preferred timing for post-therapeutic radioiodine whole-body scintigraphy based on image quality, though 48-hour acquisition may be a practical alternative when justified by operational or radiation-protection factors. The evidence is limited to imaging quality endpoints and a small cohort; clinical outcomes and applicability to high-risk disease remain unstudied.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Abstract Background Post-therapeutic [ 131 I]NaI whole-body scintigraphy (ptWBS) is mandatory after radioiodine therapy (RAIT), but the most suitable acquisition time remains uncertain. We compared image interpretability at early and delayed time points in patients with differentiated thyroid cancer (DTC). Methods This retrospective secondary analysis included prospectively acquired ptWBS data from 35 patients. Scans obtained at 6, 24, 48, 72, and 168 h after RAIT were independently ranked by three nuclear medicine physicians and evaluated with a 10-item criteria-based image-quality score. Rankings were analyzed using a Plackett-Luce model, and criteria-based scores were analyzed using generalized estimating equations. Results The analysis comprised 167 scans, 501 criteria-based ratings, and 500 intuitive rank observations. The 24-h acquisition had the highest estimated preference, followed by 48, 6, 72, and 168 h. After Holm adjustment, 24 h was favored over 6, 72, and 168 h, whereas the difference between 24 and 48 h was not significant ( P = 0.091). The criteria-based score was highest at 24 h (39.52; 95% CI, 38.62–40.43) and next-highest at 48 h (34.79); all pairwise differences in scores were significant. Each 5-point increase in the criteria-based score was associated with higher odds of a more favorable intuitive ranking (OR, 2.01; 95% CI, 1.70–2.38). Conclusions PtWBS acquired at 24 h provided the best overall interpretability of the images. A 48 h scan may be considered when practical or radiation-protection considerations favor later imaging, but equivalence to 24 h has not been established. Additional delayed imaging may still be useful when distant metastatic disease is suspected.
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