Cerebral emboli as a potential cause of Alzheimer's disease and vascular dementia: case-control study
BMJ 2006; doi: https://doi.org/10.1136/bmj.38814.696493.AE (Published 28 April 2006) Cite this as: BMJ 2006;:bmj;bmj.38814.696493.AEv1Data supplement
POSTED AS SUPPLIED BY THE AUTHORS
Appendix: TCD parameters for emboli detection
Study parameters
1
Ultrasound device
Neuroguard software version 2.9
2
Transducer type and size
2 MHz pulsed wave Doppler probe
3
Insonation artery
middle cerebral artery
4
Insonation depth
set individually
(range 40-55 mm)
5
Algorithms for signal intensity measurements
N/A
6
Scale settings
+/- 60 cm/s
7
Detection threshold
7 dB
8
Axial extension of sample volume
13 mm
9
Fast Fourier transform (FFT) size
(number of points used)
128
10
FFT length (time)
14.4 ms
11
FFT overlap
57.3%
12
Transmitted ultrasound frequency
2 MHz
13
High-pass filter settings
75 Hz
14
Recording time
One hour
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