A single measurement with (51)Cr-tagged red cells or (125)I-labeled human serum albumin in the prediction of fractional and whole blood volumes: an assessment of the limitations.

This study investigated variations in the prediction of blood volumes from a single measurement of red cell volume (RCV) with (51)Cr or plasma volume (PV) with (125)I human serum albumin (HSA). In 111 subjects, fractional and whole blood volumes were estimated from separate direct measurements of RCV and PV. The f ratio (body to venous hematocrit) was also determined.

The dependence of patient dose on factors relating to the technique and complexity of Interventional Cardiology procedures.

Dose-area product (DAP) measurements were conducted for 168 coronary angiography (CA) and 89 single vessel percutaneous transluminal coronary angioplasty (PTCA) to examine the factors influencing patient dose beyond the X-ray exposure parameters. It was found that for CA, the DAP increases with the number of catheters used and with the number of vessels with stenosis. DAP values for patients with a prior bypass surgery, were higher compared to those without such a medical record to surgery.

The variation of intrinsic spatial resolution across the UFOV of scintillation cameras.

The aim of the present study was to investigate in detail the variation of the intrinsic spatial resolution across the useful field of view (UFOV) of gamma-cameras and to explore whether this variation could lead to observable effects in clinical images. Two gamma-cameras were used, without their collimators, to acquire 560 (99m)Tc point source images at different points across their UFOVs, in order to measure the intrinsic spatial resolution at each point. Possible clinical effects of the resolution variation were examined on images of a thyroid phantom using a LEHR collimator, acquired at different locations on the UFOV and at various distances from the collimator.

Translation and validation of the Depression Outcomes Module (DOM) in Greece.

In Greece, as in other countries, major depressive disorder is underdiagnosed. Its severity, implications and outcomes are often not adequately evaluated. The Depression Outcomes Module (DOM) was developed in order to meet the need for a global assessment of this disorder.

Quality control and diagnostic reference levels in intraoral dental radiographic facilities.

Objectives: A quality control program in intraoral radiographic equipment was conducted aiming to verify compliance with the latest legal requirements and to measure radiation dose in order to contribute to the establishment of appropriate diagnostic reference levels.

Methods: This study was performed in 191 intraoral radiographic facilities in Northern Greece. The quality control program included visual inspection of the unit, registration of its characteristics, measurement and calculation of several radiological parameters, including entrance surface dose, and overall compliance with legislation requirements.