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Fig. 3. Gantry design of the C-shaped breast PET scanner. Fig. 2. Schematic of the C-shaped detector ring. ' :l ,t .;.~f;;:i 1 Fig. 1. Schematic of the C-shaped and full ring breast PET scanner. II. SYSTEM DESCRIPTION A. Scanner ConfigurationFig. 2 shows the schematic of the C-shaped breast PET scanner. The scanner consists of 24 detector modules arranged in a 2-ring configuration with a radius of 228 nun and an axial extent of 104 mm. The transaxial FOY is 200 mm. As shown in Fig. 3, the subject will be in a comfortable sitting position where the body is leaning over the scanner. This positioning can be kept without a pain for the subject and the breast movement by breathing can be reduced. ensuring inclusion of the entire breast into the effective field of view (FOY).

We developed hollow fibers with polycarbonate (PC) capillaries for use as a supporting tube. The PC capillaries were prepared by using a glass-drawing technique. Hollow PC fibers are safer and more flexible than hollow glass fibers because no fragments are released when the fibers are broken in various applications. Inner coating layers of silver and cyclic olefin polymer (COP) enhanced the reflection rate at the Er:YAG laser light wavelength. Using these fibers, we attained low loss for Er:YAG laser light transmission. By adjusting the drawing temperature in the fabrication of the PC capillaries, we created a smooth inner surface and uniform PC capillaries. We also demonstrated low-loss properties for visible pilot beams.

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