The variability of translocator protein signal in brain and blood of genotyped healthy humans using in vivo 123I-CLINDE SPECT imaging: A test-retest study
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The variability of translocator protein signal in brain and blood of genotyped healthy humans using in vivo 123I-CLINDE SPECT imaging : A test-retest study. / Feng, Ling; Jensen, Per; Thomsen, Gerda; Dyssegaard, Agnete; Svarer, Claus; Knudsen, Lars V.; Møller, Kirsten; Thomsen, Carsten; Mikkelsen, Jens D.; Guilloteau, Denis; Knudsen, Gitte M.; Pinborg, Lars H.
In: Journal of Nuclear Medicine, Vol. 58, No. 6, 2017, p. 989-995.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The variability of translocator protein signal in brain and blood of genotyped healthy humans using in vivo 123I-CLINDE SPECT imaging
T2 - A test-retest study
AU - Feng, Ling
AU - Jensen, Per
AU - Thomsen, Gerda
AU - Dyssegaard, Agnete
AU - Svarer, Claus
AU - Knudsen, Lars V.
AU - Møller, Kirsten
AU - Thomsen, Carsten
AU - Mikkelsen, Jens D.
AU - Guilloteau, Denis
AU - Knudsen, Gitte M.
AU - Pinborg, Lars H.
PY - 2017
Y1 - 2017
N2 - 123I-CLINDE is a radiotracer developed for SPECT and targets the 18-kDa translocator protein (TSPO). TSPO is upregulated in glial cells and used as a measure of neuroinflammation in a variety of central nervous system diseases. The aim of this study was to examine the test-retest variability of 123I-CLINDE binding in healthy subjects. Methods: SPECT scans were acquired over 90 min in 16 healthy controls (9 women, 8 mixed-affinity binders [MABs] and 8 high-affinity binders [HABs] twice with an interval of 35 6 15 d). Arterial input functions were based on individual blood measurements in 8 subjects and a population-based approach in combination with individual whole-blood time-activity curves in the other 8 subjects. Seven brain volumes of interest were extracted and quantified by SUVs and by 2-tissue-compartment modeling for calculation of distribution volumes (VT). Test-retest variability was measured by percentage difference (PD), the absolute PD, intraclass correlation coefficient (ICC), and coefficient of variation. Results: The absolute PD of brain SUV and the VT had similar values. The ICC values were higher for VTs than for brain SUVs, which were both moderate to high; however, lower ICC values were observed when calculated separately for HABs and MABs. Test-retest reproducibility was higher in subjects with immediate centrifugation of blood samples. The population-based method efficiently recovered data with delayed centrifugation. The VT of a 49-y-old male HAB was 7.5 6 1.4 mL/cm3 compared with 4.6 6 1.4 mL/cm3 of a sex-and age-matched MAB. The SUVs of a 49-y-old male HAB and MAB were 1.03 6 0.14 and 0.88 6 0.15 g/mL, respectively. Conclusion: The test-retest reproducibility of 123I-CLINDE is comparable or better than that reported for commonly used PET TSPO tracers. Because of the binding of 123I-CLINDE to blood cells and peripheral tissues, SUV is not a sufficient surrogate of VT from2-tissue-compartmentmodeling. The population-adjusted method has the potential to reduce the complexity of blood analyses of TSPO tracers.
AB - 123I-CLINDE is a radiotracer developed for SPECT and targets the 18-kDa translocator protein (TSPO). TSPO is upregulated in glial cells and used as a measure of neuroinflammation in a variety of central nervous system diseases. The aim of this study was to examine the test-retest variability of 123I-CLINDE binding in healthy subjects. Methods: SPECT scans were acquired over 90 min in 16 healthy controls (9 women, 8 mixed-affinity binders [MABs] and 8 high-affinity binders [HABs] twice with an interval of 35 6 15 d). Arterial input functions were based on individual blood measurements in 8 subjects and a population-based approach in combination with individual whole-blood time-activity curves in the other 8 subjects. Seven brain volumes of interest were extracted and quantified by SUVs and by 2-tissue-compartment modeling for calculation of distribution volumes (VT). Test-retest variability was measured by percentage difference (PD), the absolute PD, intraclass correlation coefficient (ICC), and coefficient of variation. Results: The absolute PD of brain SUV and the VT had similar values. The ICC values were higher for VTs than for brain SUVs, which were both moderate to high; however, lower ICC values were observed when calculated separately for HABs and MABs. Test-retest reproducibility was higher in subjects with immediate centrifugation of blood samples. The population-based method efficiently recovered data with delayed centrifugation. The VT of a 49-y-old male HAB was 7.5 6 1.4 mL/cm3 compared with 4.6 6 1.4 mL/cm3 of a sex-and age-matched MAB. The SUVs of a 49-y-old male HAB and MAB were 1.03 6 0.14 and 0.88 6 0.15 g/mL, respectively. Conclusion: The test-retest reproducibility of 123I-CLINDE is comparable or better than that reported for commonly used PET TSPO tracers. Because of the binding of 123I-CLINDE to blood cells and peripheral tissues, SUV is not a sufficient surrogate of VT from2-tissue-compartmentmodeling. The population-adjusted method has the potential to reduce the complexity of blood analyses of TSPO tracers.
KW - Polymorphism
KW - Secondgeneration TSPO tracer
KW - TSPO imaging
KW - Variability
U2 - 10.2967/jnumed.116.183202
DO - 10.2967/jnumed.116.183202
M3 - Journal article
C2 - 28572290
AN - SCOPUS:85020221596
VL - 58
SP - 989
EP - 995
JO - The Journal of Nuclear Medicine
JF - The Journal of Nuclear Medicine
SN - 0161-5505
IS - 6
ER -
ID: 196913964