MIC Detector

Digital radiography system, DDR Inventor-V, adopts MIC(Multi-channel Ionization Chamber) detector which has intrinsic features of hig efficiency by direct conversion of incident X-ray to electric signal, high fill factor without dead zone and without dead pixel and adopts scanning system which can prevent scattered radiation with fan beam. These characteristics of MIC detector provide merit of high image quality with low dose irradiation against patient.

Most of the digital radiography systems which are based on charge-coupled device(CCD) and amorphous silicon (a-Si) are indirect conversion type that uses scintillator to convert incident X-ray into visible light. That is, they need two-step process to get electronic signal for digital image and that image quality is significantly affected by scintillator. On the other hand, MIC detector is direct conversion type. The X-ray irradiation which passed through the patient penetrates into the space between the electrodes. And the gas in the chamber is ionized to generate charges on the corresponding electrodes. The induced charges are read directly by electronics.

Fill factor is the ratio of the sensitive area of the pixel to the effective area of the detector element itself. If the fill factor is small, light photons from a part of incident X-rays may never be recorded. MIC detector has no loss of effective sensing area because most of all ions are captured between the electrodes. Above all, MIC detector has nearly no dead pixel by its intrinsic characteristics.

The MIC detector has strong durability on operating such as surrounding temperature, humidity, vibration and treatment. This feature provides users with benefit on the maintenance for economic operation. Also, JSB can provide a full-coverage of customer service in short time, since it has its own technology on core parts and keeps sufficient inventory.

DQE is the measure of the combined effect of the noise and contrast performance of an imaging system. The detector with high DQE provides high quality image and potential advantage of low radiation dose. DQE of MIC detector is as high as about 50% at 2.5 lp/mm.