+ 39%. Conclusion: Even though quantitative SPECT is the most rigorous method for activity
quantification in conditions of low organ-to-background activity concentration ratio, planar …

Methods for absolute quantitation of SPECT images provide an estimate of the activity
uptakes in various organs and tissues in units of (M) Bq or (m) Ci. However, because …

Objective: The purpose of this paper is to provide information on the nature and magnitude
of the problems encountered in activity quantification by planar imaging in nuclear medicine …

Purpose: Quantitative estimation ofin vivo organ uptake is an essential part of treatment
planning for targeted radionuclide therapy. This usually involves the use of planar or SPECT …

Accurate quantification of organ radionuclide uptake is important for patient-specific
dosimetry. The quantitative accuracy from conventional conjugate view methods is limited by …

Quantitative assessment of activity levels with SPECT is difficult because of attenuation and
scattering of gamma rays within the object. To study the effect of attenuation and scatter on …

This article presents a new method for conjugate view activity quantification for 131I-labeled
monoclonal antibody distribution. Methods: The method is based on the combined use of …

Dual-isotope imaging can allow simultaneous assessment of brain perfusion using a 99mTc-
labeled tracer and neurotransmission using an 123I-labeled tracer. However, the images …

Estimating organ residence times is an essential part of patient‐specific dosimetry for
radioimmunotherapy (RIT). Quantitative imaging methods for RIT are often evaluated using …

The goals of this study were to investigatethe effectof septal penetration on 1231SPECT
activityquantitationusing low-en ergy, high-resolutioncollimators, and to evaluate a semi …