S. Nakamura

Sharp Estimand-Speci fi c Precision Envelopes for Blockwise Missing Data Under Missing at Random

Diagnostic performance of shuttle-mode myocardial CT late enhancement: Comparison with late gadolinium enhancement cardiovascular MR.

OBJECTIVES Although myocardial CT late enhancement (CT-LE) has been reported in various studies, its diagnostic performance using shuttle-mode dual-source CT has not been fully validated for detecting myocardial infarction (MI) and assessing its transmural extent against late gadolinium enhancement cardiovascular MR (L...

Sharp Estimand-Specific Precision Envelopes for Blockwise Missing Data Under Missing at Random

An overall missingness rate does not determine how much precision survives: at 25% missing, an exact calculation raises the standard error by 1.2% under one admissible mechanism and 21.4% under another. For variable or all-or-none block missingness at random, we characterize the precision attainable across mechanisms s...

Fractional Flow Reserve Measurement Using Dynamic CT Perfusion Imaging in Patients with Heavy Coronary Calcification and Stent

It is suggested that CT-DAI can derive FFR for the coronary arteries with heavy calcification and stents from dynamic myocardial CT perfusion images.

Coronary Artery Calcium Scoring with Photon-Counting Detector CT: Ultra-Low-Dose Scan Versus Coronary CT Angiography-Derived Images.

Ultra-low-dose TNC with dual-source PCD-CT showed excellent agreement with standard TNC while reducing radiation by nearly 90%.