Core Tip : It is expected that by 2017, the market size of medical image sensors (imagers) will exceed 100 million US dollars, and shipments will reach 5 million. These shipments will enable the image sensor to bring considerable development to the X-ray machine market, 3D imaging, endoscopes and other fields.
The demand for medical image sensors (imagers) is growing steadily at an annual growth rate of 9%, and the market size will exceed USD 100 million by 2017. The reason for the high growth is that the aging of developed countries has pushed up medical demand and that emerging regions are becoming richer. If the shipment of medical image sensors has maintained a growth rate of 23%, it will reach 5 million by 2017. These shipments will be contributed by low-cost image sensors for the endoscope field and new fields such as capsule endoscopes and disposable endoscopes.
In the X-ray machine market, the image sensor will shift from amorphous silicon to CMOS
In the medical and biological image sensor market, large-size sensors used by X-ray machines account for most of the share, accounting for 90% of the revenue in this field.
Amorphous silicon technology is suitable for large-scale body surface irradiation with low radiation dose. However, since the minimum pixel size is about 100 μm, the resolution is not enough for mammography and other uses. In addition, the reading speed is also limited, so the processing performance cannot reach the level required for real-time imaging such as fluoroscopy during surgery.
As the cost of CMOS processors continues to decline, ultra-thin flat panel detectors using CMOS processors have begun to seize the share of amorphous silicon flat panel detectors. The ultra-thin CMOS flat panel can improve the resolution of mammary gland X-ray machine, and can take surgical images at high speed. However, it is still difficult to manufacture wafer-sized sensors with high yield and process them into flat plates of about 15-20 cm, and the cost is also very high. Despite the growth in CMOS, the demand for CCD has not declined as much as originally expected. Because in the medical field, CCD has accumulated very rich knowledge and experience.
In the dental X-ray market, small CMOS sensors used to take X-rays of 1 to 2 teeth from the inside of the mouth have reached practical levels in Europe and are also being promoted in the United States. In the field of X-ray machines that shoot panoramic X-rays from the outside of the mouth, CCDs will still be the main focus in the future.
Single photon detection revolutionizes cancer treatment
Since the energy of a single photon hitting a CMOS sensor can be measured, it is now possible to process the information of the body tissue penetrated by the photon. If the actual size and spread of cancer can be accurately imaged, it will set off a revolution in cancer treatment. Because each pixel uses transistors and uses very high-speed computing power, it requires complex electronic technology. In order to convert the wavelength of a single X-ray photon in large quantities, it is necessary to install a CdTe light guide wafer on the CMOS chip to replace the scintillation film on the IC currently used. Therefore, it is possible that each pixel must have a protrusion for connection.
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