TAILIEUCHUNG - Warnock et al. EJNMMI Research 2011, 1:13 http://www.ejnmmires.com/content/1/1/13 ORIGINAL

Warnock et al. EJNMMI Research 2011, 1:13 ORIGINAL RESEARCH Open Access Use of a beta microprobe system to measure arterial input function in PET via an arteriovenous shunt in rats Geoff Warnock1*, Mohamed-Ali Bahri1, David Goblet1, Fabrice Giacomelli1, Christian Lemaire1, Joel Aerts1, Alain Seret3, Xavier Langlois2, Andre Luxen1 and Alain Plenevaux1 Abstract Background: Kinetic modeling of physiological function using imaging techniques requires the accurate measurement of the time-activity curve of the tracer in plasma, known as the arterial input function (IF). The measurement of IF can be achieved through manual blood sampling, the use of small counting systems such as beta microprobes, or by derivation. | Warnock et al. EJNMMI Research 2011 1 13 http content 1 1 13 9 EJNMMI Research a SpringerOpen Journal ORIGINAL RESEARCH Open Access Use of a beta microprobe system to measure arterial input function in PET via an arteriovenous shunt in rats 1 1 1 1 11 Geoff Warnock Mohamed-Ali Bahri David Goblet Fabrice Giacomelli Christian Lemaire Joel Aerts Alain Seret3 Xavier Langlois2 Andre Luxen1 and Alain Plenevaux1 Abstract Background Kinetic modeling of physiological function using imaging techniques requires the accurate measurement of the time-activity curve of the tracer in plasma known as the arterial input function IF . The measurement of IF can be achieved through manual blood sampling the use of small counting systems such as beta microprobes or by derivation from PET images. Previous studies using beta microprobe systems to continuously measure IF have suffered from high background counts. Methods In the present study a light-insensitive beta microprobe with a temporal resolution of up to 1 s was used in combination with a pump-driven femoral arteriovenous shunt to measure IF in rats. The shunt apparatus was designed such that the placement of the beta microprobe was highly reproducible. The probe-derived IF was compared to that obtained from manual sampling at 5-s intervals and IF derived from a left ventricle VOI in a dynamic PET image of the heart. Results Probe-derived IFs were very well matched to that obtained by gold standard manual blood sampling but with an increased temporal resolution of up to 1 s. The area under the curve AUC ratio between probe- and manually derived IFs was with a coefficient of variation of . However image-derived IFs were significantly underestimated compared to the manually sampled IFs with an AUC ratio of with a coefficient of variation of . Conclusions IF derived from the beta microprobe accurately represented the IF as measured by blood sampling was reproducible and was more accurate .

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