title: Noninvasive bi-graphical analysis for the quantification of slowly reversible radioligand binding.
abstract: In this paper, we presented a novel reference-region-based (noninvasive) bi-graphical analysis for the quantification of a reversible radiotracer binding that may be too slow to reach relative equilibrium (RE) state during positron emission tomography (PET) scans. The proposed method indirectly implements the noninvasive Logan plot, through arithmetic combination of the parameters of two other noninvasive methods and the apparent tissue-to-plasma efflux rate constant for the reference region ([Formula: see text]). We investigated its validity and statistical properties, by performing a simulation study with various noise levels and [Formula: see text] values, and also evaluated its feasibility for [18F]FP-CIT PET in human brain. The results revealed that the proposed approach provides distribution volume ratio estimation comparable to the Logan plot at low noise levels while improving underestimation caused by non-RE state differently depending on [Formula: see text]. Furthermore, the proposed method was able to avoid noise-induced bias of the Logan plot, and the variability of its results was less dependent on [Formula: see text] than the Logan plot. Therefore, this approach, without issues related to arterial blood sampling given a pre-estimate of [Formula: see text] (e.g. population-based), could be useful in parametric image generation for slow kinetic tracers staying in a non-RE state within a PET scan.
authors: Department of Nuclear Medicine, College of Medicine, Seoul National University, Seoul, Korea. Department of Brain and Cognitive Sciences, College of Natural Sciences, Seoul National University, Seoul, Korea. Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea.
authors: Seongho
authors: S
authors: Seo
authors: Su Jin
authors: SJ
authors: Kim
authors: Hye Bin
authors: HB
authors: Yoo
authors: Jee-Young
authors: JY
authors: Lee
authors: Yu Kyeong
authors: YK
authors: Kim
authors: Dong Soo
authors: DS
authors: Lee
authors: Yun
authors: Y
authors: Zhou
authors: Jae Sung
authors: JS
authors: Lee
mesh_terms: D000328:Adult; D000368:Aged; D000465:Algorithms; D001921:Brain / Q000000981:diagnostic imaging* / Q000378:metabolism; D016022:Case-Control Studies; D003198:Computer Simulation; D005240:Feasibility Studies; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D007700:Kinetics; D008875:Middle Aged; D010300:Parkinson Disease / Q000000981:diagnostic imaging* / Q000378:metabolism; D049268:Positron-Emission Tomography / Q000379:methods*; D014326:Tropanes / Q000378:metabolism*
chemical_list: D014326:Tropanes; C087552:2-carbomethoxy-8-(3-fluoropropyl)-3-(4-iodophenyl)tropane