Digital Radiografi

Digital radiography is a form of imaging sinar_X, where the sensors use digital X-rays replace the conventional photographic film. And chemical processing is replaced with a computer system that is connected to the monitor or laser printer.

1. Components of Digital Radiography

Radiographi a digital system consists of four major components, namely X-ray source, detector, Analog-Digital Converter, Computer, and Output Device.

a. X-ray Source

Sources are used to generate X-ray on the same DR X-ray sources in Coventional Radiography. Therefore, to change the conventional radiography to DR does not need to replace the X-ray.

b. Image Receptor

Image Receptor serves as a detector that replaces the existence of tapes and films. There are two types of digital image capture devices, namely Flat Panel Detectors (FPDs) and High Density Line Scan Solid State Detectors.

1) Flat Panel Detectors (FPDs)

FPDs is the type of detector that are assembled into a thin panel. Based on the material, FPDs can be divided into two, namely

a) Amorphous Silicon

Amorphous Silicon (a-Si) classified as indirect image capture technology for X-ray is converted into light. With the detectors a-Si, a scintillator detector in the outer layer (made of Cesium Iodide or Gadolinium Oksisulfat), convert X-rays into light. Light is then passed through a layer of a-Si photoiodida which light is converted into a digital output signal. The digital signal is then read by a thin-film transistor (TFT's) or by Charged Couple Device (CCD's). The image data is sent to a computer for display. A-Si detector FPD is the type most widely sold in the digital imaging industry today.

b) Amorphous Selenium (a-Se)

Amorphous selenium (a-Se) is known as direct detector because there is no conversion of X-ray energy into light. The outermost layer of the flat panel is a high voltage electrode bias. Bias electrode accelerating energy of X-rays captured mealui selenium layer. Photon-photon X-ray flow through the selenium layer creates an electron hole pair. Electron holes are stored in the selenium-based charging bias voltage. Pattern (the holes) are formed in the selenium layer is read by rangakaian TFT or electrometer probes to interpret the image.

2) High Density Line Scan Solid State devices

The second type of image capture on DR is High Density Line Scan Solid State devices. The tool consists of Barium Fluoro Bromide Photostimulable combined with Europium (BaFlBr: Eu) Phosphorus tattoo Cesium Bromide (CSBR).

Fosofor detectors record the X-ray energy during irradiation and scanned (scan) by a linear laser diode to release the stored energy is then read by a digital image capture Charge Coupled Devices (CCD's). Image data is then transferred by the technologist to be displayed and sent to the work station owned by radiologist.

c. Analog to Digital Converter

This component serves to change the analog data issued by the detector into digital data that can be interpreted by a computer.

d. Computer

This component is used to process the data, image manipulation, storing data (image), and connect it to the output device or work station.

e. Output Device

A digital radiography system has a monitor to display the image. Through this monitoring, the radiographer can determine whether or not an image to be transmitted to the work station radiologist.

In addition to the monitor, output device can be either a laser printer if you want to obtain the data in physical form (radiograph). Media used to print the image in the form of a special film (cleaning view) that does not require chemical processing to mengasilkan image.

The resulting image can be directly transmitted in digital form to the radiologist in the reading room work station through the network. In this way, it is possible readings through teleradiology photo.

Aircraft Digital Radiography

2. Working Principle

Working principle of Digital Radiography (DR) or (DX) is essentially capture without the use of X-ray film. Instead of X-ray films, use a digital image capture to record X-ray images and turn them into digital files that can be displayed or printed out to be read and stored as part of the patient medical record.