Table 2

Actual frequencies of different patterns of abnormal cerebral blood flow (CBF) for the five largest disease groups

Pattern of CBF abnAlzheimer’s diseaseVascular dementiaLewy body diseaseFrontotemporal dementiaProgressive aphasia
Bilateral posterior395440
Bilateral posterior plus unilateral anterior203900
Unilateral posterior96017
Bilateral anterior3130215
Bilateral anterior plus unilateral posterior28074
Unilateral anterior23031
Unilateral anterior plus unilateral posterior57042
Generalised2610561
Patchy1420482
No abnormality123240
Total13278245822
  • CBF abn = cerebral blood flow abnormality.