Assessment myocardial perfusion and contraction by Karhunen-Loeve transform on scintigraphic images.

Theory and previous studies showed that KLT (an application of principal component transform for imaging) can be use for analysis of cardiac function. This paper presents the results of our studies concerning the applications of KLT for images smoothing, quantification of myocardial contraction, and improvement of inter-observer reproducibility in cardiac imaging. The paper also describes the use of 4D cardiac phantom to quantify Karhunen-Loeve images.

[Contribution of quantitative radio-scintigraphy to diagnosis of wrist injuries undetected on plain films: a prospective study of 154 cases].

Purpose Of The Study: Fractures of the scaphoid must be diagnosed quickly to avoid persistent nonunion and the risk of osteoarthritis. Despite meticulous physical examination and adequate x-ray detection, numerous occult fractures still go unrecognized. The aim of this prospective study was to analyze the pertinence of quantitative radio-scintigraphy (QRS) presently used for the diagnosis of occult wrist fractures.

Poststress motionlike artifacts caused by the use of a dual-head gamma camera for (201)Tl myocardial SPECT.

Unlabelled: When performing (201)Tl myocardial SPECT using a dual-head gamma camera on patients after exercise stress, we have observed in some a sudden increase in the counting rate between the 16th and 17th images. This increase provoked motionlike artifacts, which increased the number of false-positive findings. The aim of our study was to determine possible causes for this leap in activity.