Diagnostic effectiveness of quantitative [18F]flutemetamol PET imaging for detection of fibrillar amyloid β using cortical biopsy histopathology as the standard of truth in subjects with idiopathic normal pressure hydrocephalus

Table 4 Scheme for classifying biopsy results

[¹⁸F]flutemetamol PET result	Aβ Pathology standard of truth
[¹⁸F]flutemetamol PET result	Abnormal	Normal
Abnormal	True positive (TP)	False positive (FP)
Normal	False negative (FN)	True negative (TN)

ISSN: 2051-5960