A fluid coolant system for of a medical imaging apparatus, comprising: a gantry forming a patient tunnel; a cooling apparatus, coupled to and external the gantry, having a coolant supply for supplying fluid coolant to the gantry, and a coolant return for returning the coolant to the cooling apparatus; a detector electronic assembly within the gantry, coupled to the cooling apparatus, having: a housing; detector elements in the housing, for detecting incident photons of electromagnetic radiation originating outside of the housing; other electronic components (48, 50) in the housing; a fluid cooled, first chill plate (52, 152) thermally conductively coupled to the detector elements, for cooling the detector elements, the first chill plate (52, 152) having a first inlet for receiving the coolant from the coolant supply and a first outlet for discharging the coolant to the coolant return; and a fluid cooled, second chill plate thermally conductively coupled to the other electronic components (48, 50) for cooling the other electronic components (48, 50), the second chill plate having a second inlet for receiving the coolant from the coolant supply and a second outlet for discharging the coolant to the coolant return; the fluid coolant system, further comprising: the detector elements having detector element components projecting away therefrom, defining a first surface profile; the first chill plate (52, 152) in thermally conductive, direct contact with at least a portion of the first surface profile of the detector element components; at least one of the other electronic components (48, 50) defining a second surface profile; and the second chill plate in thermally conductive, direct contact with at least a portion of the second surface profile of the at least one of the other electronic components (48, 50). a gantry forming a patient tunnel; a cooling apparatus, coupled to and external the gantry, having a coolant supply for supplying fluid coolant to the gantry, and a coolant return for returning the coolant to the cooling apparatus; a detector electronic assembly within the gantry, coupled to the cooling apparatus, having: a housing; detector elements in the housing, for detecting incident photons of electromagnetic radiation originating outside of the housing; other electronic components (48, 50) in the housing; a fluid cooled, first chill plate (52, 152) thermally conductively coupled to the detector elements, for cooling the detector elements, the first chill plate (52, 152) having a first inlet for receiving the coolant from the coolant supply and a first outlet for discharging the coolant to the coolant return; and a housing; detector elements in the housing, for detecting incident photons of electromagnetic radiation originating outside of the housing; other electronic components (48, 50) in the housing; a fluid cooled, first chill plate (52, 152) thermally conductively coupled to the detector elements, for cooling the detector elements, the first chill plate (52, 152) having a first inlet for receiving the coolant from the coolant supply and a first outlet for discharging the coolant to the coolant return; and the detector elements having detector element components projecting away therefrom, defining a first surface profile; the first chill plate (52, 152) in thermally conductive, direct contact with at least a portion of the first surface profile of the detector element components; at least one of the other electronic components (48, 50) defining a second surface profile; and the second chill plate in thermally conductive, direct contact with at least a portion of the second surface profile of the at least one of the other electronic components (48, 50).