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Instrumentation and calibration methods for the multichannel measurement of phase and amplitude in optical tomography
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10.1063/1.1884193
/content/aip/journal/rsi/76/4/10.1063/1.1884193
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/4/10.1063/1.1884193
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

(Color online) High-voltage calibration tables for (a) phase, (b) the logarithm of amplitude. The separate lines correspond to the 16 detectors.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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).

Image of FIG. 6.
FIG. 6.

(a) Amplitude, (b) phase during system warm-up.

Image of FIG. 7.
FIG. 7.

Calibrated data from a homogeneous cylindrical phantom (a) , (b) phase.

Image of FIG. 8.
FIG. 8.

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.

Image of FIG. 9.
FIG. 9.

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.

Image of FIG. 10.
FIG. 10.

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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/content/aip/journal/rsi/76/4/10.1063/1.1884193
2005-03-23
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Instrumentation and calibration methods for the multichannel measurement of phase and amplitude in optical tomography
http://aip.metastore.ingenta.com/content/aip/journal/rsi/76/4/10.1063/1.1884193
10.1063/1.1884193
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