In the steady state method, 15O-labeled gases (C15O2, 15O2 and C15O) are administered
to the body by continuous inhalation in various clinical PET studies. During inhalation, the …

Biological Analysis and Dosimetry for 15O-Labeled02, C02, and CO Gases Administered
Continuously by Inhalation Page 1 BASIC SCIENCES PHYSICS AND RADIATION BIOLOGY …

Estimates of the radiation dose to the upper airways including the trachea, oropharnyx, and
nasal linings from inhalation of oxygen-15 labeled CO/sub 2/studies are provided. Three air …

The thermoluminescent dosimeter (TLD) method has been proposed as a useful tool for
estimating internal radiation absorbed dose in nuclear medicine. An efficient approach to …

According to Powell et al.(5), significant retention of 150in the tracheal mucosa results in a
radiation absorbed dose of 75 to 200 rad upon breathing of 150-C02for one hour at 1 …

K, ypton-81m is introduced into the lungs by means of inhalation of air or oxygen
continuously flowing at 2— 3 liters per mm throughthe 8lRbfllmKrgeneratorinto a mask …

There has been no consensus on a standard calculational approach regarding the concept
of administered activity in ventilation studies involving inhaled radioisotope gas or …

Background 15 O-oxygen inhalation PET is unique in its ability to provide fundamental
information regarding cerebral hemodynamics and energy metabolism in man. However, the …

Cerebral oxygen metabolism (CMRO 2) and fractional extraction (OEF) regional values
obtained using the 15 O steady-state method and positron-emission tomography (PET) were …

The purpose of this study is to investigate the influence of lung heterogeneity inside a soft
tissue phantom on percentage depth dose (PDD). PDD curves were obtained …