EuroPCR2026-images-95401-behind-doughnut

What is the true calcium architecture that explains the doughnut sign from comprehensive in-vivo imaging modalities (PCCT, OCT & IVUS)?
Continuous circumferential calcific sheet/ring
Discontinuous calcific ring with microfracture
Focal nodular protrusion toward lumen
Correct! The correct answer is "Continuous circumferential calcific sheet/ring".
 
A post-mortem human coronary artery was evaluated using in-vivo imaging surrogates and subsequently by ex-vivo reference standards including micro-CT and histopathology. PCCT demonstrates a high-density “doughnut-like” ring. OCT delineates its circumferential extent. IVUS shows heterogeneous backscatter within the calcific arc.Pathologically, calcium deposition begins along the peripheral margin of the necrotic core, the central compartment of which may remain non-calcified. The cholesterol clefts observed in H&E offered a plausible tissue correlate for this process. PCCT appears to be the only in-vivo modality in our dataset that clearly depicts this distinctive signature.

 
Good try! The correct answer is "Continuous circumferential calcific sheet/ring".
 
A post-mortem human coronary artery was evaluated using in-vivo imaging surrogates and subsequently by ex-vivo reference standards including micro-CT and histopathology. PCCT demonstrates a high-density “doughnut-like” ring. OCT delineates its circumferential extent. IVUS shows heterogeneous backscatter within the calcific arc.Pathologically, calcium deposition begins along the peripheral margin of the necrotic core, the central compartment of which may remain non-calcified. The cholesterol clefts observed in H&E offered a plausible tissue correlate for this process. PCCT appears to be the only in-vivo modality in our dataset that clearly depicts this distinctive signature.
 
 
{"name":"EuroPCR2026-images-95401-behind-doughnut", "url":"https://www.poll-maker.com/Q8NQ8FQ1L","txt":"What is the true calcium architecture that explains the doughnut sign from comprehensive in-vivo imaging modalities (PCCT, OCT & IVUS)?, Correct! The correct answer is \"Continuous circumferential calcific sheet\/ring\".   A post-mortem human coronary artery was evaluated using in-vivo imaging surrogates and subsequently by ex-vivo reference standards including micro-CT and histopathology. PCCT demonstrates a high-density “doughnut-like” ring. OCT delineates its circumferential extent. IVUS shows heterogeneous backscatter within the calcific arc.Pathologically, calcium deposition begins along the peripheral margin of the necrotic core, the central compartment of which may remain non-calcified. The cholesterol clefts observed in H&E offered a plausible tissue correlate for this process. PCCT appears to be the only in-vivo modality in our dataset that clearly depicts this distinctive signature., Good try! The correct answer is \"Continuous circumferential calcific sheet\/ring\".   A post-mortem human coronary artery was evaluated using in-vivo imaging surrogates and subsequently by ex-vivo reference standards including micro-CT and histopathology. PCCT demonstrates a high-density “doughnut-like” ring. OCT delineates its circumferential extent. IVUS shows heterogeneous backscatter within the calcific arc.Pathologically, calcium deposition begins along the peripheral margin of the necrotic core, the central compartment of which may remain non-calcified. The cholesterol clefts observed in H&E offered a plausible tissue correlate for this process. PCCT appears to be the only in-vivo modality in our dataset that clearly depicts this distinctive signature.","img":"https://www.poll-maker.com/3012/images/ogquiz.png"}
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