The main block diagram of the instrument, including the laser diodes, source switches, radio frequency generation system and phase-locked loop. splitter, diode, frequency, oscillator, frequency, -pass filter, -time system integration, controlled crystal oscillator, modulation frequency, modulation frequency.
The light detection unit consisting of the photomultiplier tube with rf and dc amplifiers. -to-analog converter, -to-digital converter, oscillator, frequency, frequency, splitter, , -time system integration.
(Color online) High-voltage calibration tables for (a) phase, (b) the logarithm of amplitude. The separate lines correspond to the 16 detectors.
Phase-amplitude cross talk. The measured uncalibrated phase is given as a function of dc anode current at a high voltage setting of (a) , (b) , and (c) . The pre-scan target is marked with a vertical line.
Short-term repeatability as a function of source-detector distance and measurement time per source at a source power of . (a) , (b) phase. Measurement per source (open dot), (“+”), (diamond), and (filled dot).
(a) Amplitude, (b) phase during system warm-up.
Calibrated data from a homogeneous cylindrical phantom (a) , (b) phase.
Geometry and contents of (a) phantom A in 3D, (b) the plane of phantom A, (c) phantom B in 3D, and (d) the plane of phantom B.
Cross-sectional image of (a) absorption (simulated data), (b) scatter (simulated data), (c) absorption (measured data), (d) scatter (measured data) through the center of phantom A.
Cross-sectional image of (a) absorption (simulated data), (b) scatter (simulated data), (c) absorption (measured data), (d) scatter (measured data) through the center of phantom B.
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