The Northwest’s Phantom Pool

Validation of gated blood-pool SPECT cardiac measurements tested using a biventricular dynamic physical phantom.

UNLABELLED We have developed a biventricular dynamic physical cardiac phantom to test gated blood-pool (GBP) SPECT image-processing algorithms. Such phantoms provide absolute values against which to assess accuracy of both right and left computed ventricular volume and ejection fraction (EF) measurements. METHODS Two silicon-rubber chambers driven by 2 piston pumps simulated crescent-shaped r...

Crossing the phantom divide

We consider fluid perturbations close to the ‘‘phantom divide’’ characterized by p and discuss the conditions under which divergencies in the perturbations can be avoided. We find that the behavior of the perturbations depends crucially on the prescription for the pressure perturbation p. The pressure perturbation is usually defined using the dark energy rest-frame, but we show that this frame ...

The Phantom Herd

The phantom of transparency

I will discuss the status of the implicit and the explicit in science, mostly in logic1. I will especially denunciate, expose a deep and pregnant unsaid of scientific activity : the subliminal idea that, beyond immediate perception, could exist a world, a layer of reading, completely intelligible, i.e., explicit and immediate. What I will call the fantasy (or phantom, as a matter of joke) of tr...

The phantom limb.