Limitations of bi-linear regression analysis for the determination of receptor occupancy with positron emission tomography

Ralph Buchert, J. Varga, Janos Mester

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Background and objectives: Linear/multilinear regression methods are widely used in quantitative neuroreceptor positron emission tomography. A reference tissue method based on a bi-linear operational equation, the bi-linear reference tissue method, has been introduced in order to overcome the need for arterial blood sampling. The aim of the present paper was to investigate the sensitivity of the bi-linear reference tissue method to statistical noise, with special regard to the assessment of receptor occupancy. In addition, improvement of the bi-linear reference tissue method by regularization using physiological constraints was evaluated. Methods: Application of the bi-linear method to dynamic positron emission tomography using the serotonin transporter ligand 11C-(+)McN5652 was considered. Investigations were performed by computer simulations and analysis of 29 patient studies. Results: The equilibrium specific-to-non-specific partition coefficient V″3 was significantly underestimated by the bi-linear reference tissue method. At realistic noise levels the extent of the underestimation ranged from 25% to 75% for partition coefficients ranging from 0.3 to 0.3, respectively. This caused a 15-60% underestimation of changes in receptor occupancy after simulated intervention. The noise dependence of the bias was confirmed in the patient studies. Regularization significantly reduced the underestimation of the occupancy. Conclusions: When receptor status or noise level vary substantially, as in receptor occupancy studies, the bias of the bi-linear reference tissue method should be taken into account.

Original languageEnglish
Pages (from-to)451-459
Number of pages9
JournalNuclear Medicine Communications
Volume25
Issue number5
DOIs
Publication statusPublished - May 2004

Fingerprint

Positron-Emission Tomography
Linear Models
Regression Analysis
Noise
Serotonin Plasma Membrane Transport Proteins
Sensory Receptor Cells
Computer Simulation
Ligands

Keywords

  • Modelling
  • Multilinear regression
  • PET
  • Receptor occupancy
  • Reference tissue

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Limitations of bi-linear regression analysis for the determination of receptor occupancy with positron emission tomography. / Buchert, Ralph; Varga, J.; Mester, Janos.

In: Nuclear Medicine Communications, Vol. 25, No. 5, 05.2004, p. 451-459.

Research output: Contribution to journalArticle

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