ArticleCardiovascular and interventional radiology2026
Quantitative Comparison of Yettirium-90 (Y90) PET/CT and Y90 SPECT/CT Voxel-Based Dosimetry post Resin Y90 Microsphere Radioembolization.
Article in Cardiovascular and interventional radiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04172714 (Theragnostic Low Dose Y90 Microspheres for Personalized Y90 Radioembolization Dosimetry Planning), which is not on this map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Theragnostic Low Dose Y90 Microspheres for Personalized Y90 Radioembolization Dosimetry Planning
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10 authors.
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Abstract
purposeTo quantitatively compare Y90 PET/CT and Y90 SPECT/CT voxel-based dosimetry after RESIN Y90 TARE in hepatocellular carcinoma (HCC). This was a secondary aim of a previously published prospective single-center trial evaluating low-dose scout RESIN Y90 for treatment planning (NCT04172714). MATERIALS AND
methodsThirty patients with 33 treatment-naïve HCC lesions underwent Y90 PET/CT and SPECT/CT after scout and therapeutic RESIN Y90. Voxel-based dosimetry (local deposition method) yielded mean, minimum, and the mean dose to the highest-dosed 30% (V30) and 70% (V70) of the volume, for tumor dose (TD) and non-tumoral liver dose (NTLD). Identical PET/CT-derived contours were applied to the SPECT/CT, and agreement was assessed by Bland-Altman analysis and intraclass correlation (ICC).
resultsTD-mean (494 vs. 366 Gy), TD-V30 (594 vs. 408 Gy), and TD-V70 (405 vs. 326 Gy) were higher on PET/CT than SPECT/CT, while NTLD-mean (103 vs. 182 Gy) and NTLD-V70 (77 vs. 141 Gy) were lower on PET/CT (all p < 0.001). Correlations were very strong for TD-mean, TD-min, TD-V30, TD-V70, NTLD-mean, and NTLD-V30 (r > 0.9). Relative to PET/CT, SPECT/CT underestimated TD-mean by 127 Gy (95% limits of agreement -435 to 181 Gy) and overestimated NTLD-mean by 79 Gy; ICC was low for several non-tumoral endpoints (NTLD-mean 0.57, 95% CI -0.09 to 0.86) despite strong correlation.
conclusionsAfter RESIN Y90 TARE for HCC, PET/CT calculated higher TD and lower NTLD than SPECT/CT, correlating strongly but with a potentially clinically relevant systematic bias and wide limits of agreement. The modalities should not be considered interchangeable without modality-specific thresholds or further validation.
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