We assembled a compact, hand-held gamma-ray imaging probe (MediPROBE) which could be utilized for different medical imaging tasks, including sentinel lymph node localization and scintigraphy of difficult to reach anatomical sites. Here, we report on the first images obtained with this device. The imaging system is based on a room temperature semiconductor pixel detector (1 mm-thick CdTe) with 256×256 square pixels arranged with a 55 micrometer pitch (sensitive area D×D = 14.08×14.08 mm2), coupled pixel-by-pixel via bump-bonding to the Medipix2 photon counting readout CMOS Application Spe-cific Integrated Circuit (ASIC). A set of interchangeable knife-edge pinhole collimators (1.1, 1.9 and 2.1 mm effective diameter at 140 keV) has been realized to obtain different spatial resolu-tions, and a set of plastic spacers (3 cm or 6 cm total length) can be placed in front of the camera in order to set the skin-to-collimator distance and, hence, to fix the field of view (FOV), working in demagnification. The probe is connected directly to a notebook using a dedicated USB interface and is powered via the USB port. The high voltage (-100 V @ 1 microA) necessary to bias the CdTe detector is provided either from an external power supply or from a pack of eight batteries. This compact probe weights 1.5 kg without shield and 3.2 kg with a lead shield; it can be mounted on an articulated arm for bed-side operation. MediPROBE provides live-time photon counting gamma-ray imaging at a rate < 1 fps.
The MediPROBE CdTe Based Compact Gamma Camera / Russo, Paolo. - (2009). (Intervento presentato al convegno World Congress on Medical Physics and Biomedical Engineering tenutosi a Munich, Germany nel 7-12 settembre 2009).
The MediPROBE CdTe Based Compact Gamma Camera.
RUSSO, PAOLO
2009
Abstract
We assembled a compact, hand-held gamma-ray imaging probe (MediPROBE) which could be utilized for different medical imaging tasks, including sentinel lymph node localization and scintigraphy of difficult to reach anatomical sites. Here, we report on the first images obtained with this device. The imaging system is based on a room temperature semiconductor pixel detector (1 mm-thick CdTe) with 256×256 square pixels arranged with a 55 micrometer pitch (sensitive area D×D = 14.08×14.08 mm2), coupled pixel-by-pixel via bump-bonding to the Medipix2 photon counting readout CMOS Application Spe-cific Integrated Circuit (ASIC). A set of interchangeable knife-edge pinhole collimators (1.1, 1.9 and 2.1 mm effective diameter at 140 keV) has been realized to obtain different spatial resolu-tions, and a set of plastic spacers (3 cm or 6 cm total length) can be placed in front of the camera in order to set the skin-to-collimator distance and, hence, to fix the field of view (FOV), working in demagnification. The probe is connected directly to a notebook using a dedicated USB interface and is powered via the USB port. The high voltage (-100 V @ 1 microA) necessary to bias the CdTe detector is provided either from an external power supply or from a pack of eight batteries. This compact probe weights 1.5 kg without shield and 3.2 kg with a lead shield; it can be mounted on an articulated arm for bed-side operation. MediPROBE provides live-time photon counting gamma-ray imaging at a rate < 1 fps.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
