Detector assembly for multi-modality scanners

A detector assembly for multi-modality scanners for detecting low and/or high energy radiation emitted from a source under investigation, the detector assembly comprising:

• a low energy radiation detector substantially transparent to the high energy radiation but responsive to low energy radiation from the source, said low energy radiation detector producing, in response to the low energy radiation, first radiation characterizing signals, said low energy radiation detector comprising a CsI(TI) scintillator;
• a high energy radiation detector located downstream from the low energy radiation detector and responsive to the high energy radiation from the source;
• said high energy radiation detector producing, in response to the high energy radiation, second radiation characterizing signals;
• said high energy radiation detector including a LSO scintillator downstream of and optically coupled to the CsI(TI) scintillator and a GSO scintillator downstream of and optically coupled to the LSO scintillator;
• and
• a photodetector optically coupled to at least one of said scintillators said photodetector producing, in response to the radiation characterizing signals from said at least one of said scintillators, corresponding electric signals.

A multi-layer detector assembly for multi-modality scanners for detecting X-rays and low and high energy gammas emitted from a source under investigation, said detector assembly comprising:

• an X-ray detecting layer substantially transparent to low and high energy gammas and producing, in response to X-rays from the source, X-ray characterizing signals;
• a low energy gamma detecting layer located downstream from said X-ray detecting layer and producing, in response to low energy gammas from the source, first gamma characterizing signals;
• and
• a high energy gamma detecting layer located downstream of the low energy gamma detecting layer and producing, in response to high energy gammas from the source, second gamma characterizing signals.

A detector assembly for multi-modality scanners for detecting low energy radiation and first and second levels of high energy radiation emitted from a source under investigation, the detector assembly comprising:

• a low energy radiation detector substantially transparent to the first and second levels of high energy radiation but responsive to the low energy radiation from the source, said low energy radiation detector producing, in response to said low energy radiation, first radiation characterizing signals;
• a first high energy radiation detector located downstream from said low energy radiation detector and responsive to the first level of high energy radiation from the source, said first high energy radiation detector producing, in response to said first level of high energy radiation, second radiation characterizing signals;
• and
• a second high energy radiation, detector located downstream from said low energy radiation detector and responsive to the second level of high energy radiation from the source, said second high energy radiation detector producing, in response to the second level of high energy radiation, third radiation characterizing signals.