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Small prototype of Anger camera with submillimeter position resolution
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View: Figures


Image of FIG. 1.
FIG. 1.

Layout of the monolithic array of 19 SDDs. The detector side where the drift rings and the front-end JFET are integrated is shown. The scintillator is coupled to the opposite side of the detector.

Image of FIG. 2.
FIG. 2.

(a) Cross section (not to scale) of the SDD showing the back side biasing technique based on the a reach-through flow of the leakage hole current toward the last ring electrode. (b) Drawing of the potential distribution in the described biasing conditions. Zero length and depth are located at the center of the anode.

Image of FIG. 3.
FIG. 3.

Schematic cross section of the assembly structure of the Anger camera.

Image of FIG. 4.
FIG. 4.

Scheme of the collimation system adopted in the measurements.

Image of FIG. 5.
FIG. 5.

Calculated intensity distribution of the -ray source through the collimator.

Image of FIG. 6.
FIG. 6.

Electronics noise of the array units measured at . Unit 8 is not reported because it is damaged.

Image of FIG. 7.
FIG. 7.

2D position distribution of four irradiation points in the central region of the array.

Image of FIG. 8.
FIG. 8.

Fitting of the distribution shown in Fig. 6 across two points.

Image of FIG. 9.
FIG. 9.

(a) 2D distribution of 11 points disposed along a line. (b) Scheme illustrating the distances among the points.

Image of FIG. 10.
FIG. 10.

(a) Measured coordinates of the points along the scan. (b) Deviation from the fitting line.

Image of FIG. 11.
FIG. 11.

Measured resolution of the irradiated points. The intrinsic resolution of the Anger camera obtained by subtracting in square the contribution of the collimator is also reported.

Image of FIG. 12.
FIG. 12.

Energy spectrum of the source measured on a central point of the scan.

Image of FIG. 13.
FIG. 13.

Energy resolution of the points measured in the scan.

Image of FIG. 14.
FIG. 14.

Event total measured signal obtained by summing all signals from the units.

Image of FIG. 15.
FIG. 15.

2D distribution of three points obtained by irradiation with a source.

Image of FIG. 16.
FIG. 16.

Photograph of the collimator used for the test of the imaging capabilities of the Anger camera.

Image of FIG. 17.
FIG. 17.

Irradiation scheme of the Anger camera using the lead collimator.

Image of FIG. 18.
FIG. 18.

Images measured with the Anger camera in correspondence of two orientations of the collimator.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Small prototype of Anger camera with submillimeter position resolution