Automated Extraction of the Arterial Input Function from Brain Images for Parametric PET Studies

Overview

Journal EJNMMI Res

Date 2024 Apr 1

PMID 38558200

Authors

Hamed Moradi

Rajat Vashistha

Soumen Ghosh

Kieran OBrien

Amanda Hammond

Axel Rominger

Hasan Sari

Kuangyu Shi

Viktor Vegh

David Reutens

Affiliations

Soon will be listed here.

Abstract

Background: Accurate measurement of the arterial input function (AIF) is crucial for parametric PET studies, but the AIF is commonly derived from invasive arterial blood sampling. It is possible to use an image-derived input function (IDIF) obtained by imaging a large blood pool, but IDIF measurement in PET brain studies performed on standard field of view scanners is challenging due to lack of a large blood pool in the field-of-view. Here we describe a novel automated approach to estimate the AIF from brain images.

Results: Total body F-FDG PET data from 12 subjects were split into a model adjustment group (n = 6) and a validation group (n = 6). We developed an AIF estimation framework using wavelet-based methods and unsupervised machine learning to distinguish arterial and venous activity curves, compared to the IDIF from the descending aorta. All of the automatically extracted AIFs in the validation group had similar shape to the IDIF derived from the descending aorta IDIF. The average area under the curve error and normalised root mean square error across validation data were - 1.59 ± 2.93% and 0.17 ± 0.07.

Conclusions: Our automated AIF framework accurately estimates the AIF from brain images. It reduces operator-dependence, and could facilitate the clinical adoption of parametric PET.

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