What is the difference between conventional radiography and digital radiography?
In conventional radiography, high image contrast (a large difference between grey shades) is inevitably associated with a narrow latitude (a low number of grey steps). With digital radiographs, it is possible to display an image with a wide latitude, while preserving high image contrast.
What is conventional radiography?
Conventional radiography Radiography is the use of x-rays to visualize the internal structures of a patient. X-Rays are a form of electromagnetic radiation, produced by an x-ray tube. The x-rays are passed through the body and captured behind the patient by a detector; film sensitive to x-rays or a digital detector.
What is difference between DR and CR?
When it comes to the DR and CR abbreviations for debit and credit, a few theories exist. Another theory is that DR stands for “debit record” and CR stands for “credit record.” Finally, some believe the DR notation is short for “debtor” and CR is short for “creditor.”
What is CR and DR in radiology?
CR is the abbreviation for Computed Radiography. Digital Radiography, DR in the short term is the latest technology in radiography. The DR technology transfer automatically the images to a computer. So you can quickly evaluate and propose a diagnosis.
What are the types of digital radiography?
There are two types of digital imaging systems used in intraoral radiography – computed radiography (CR) and direct radiography (DR). CR uses a photostimulable phosphor (PSP) plate to capture the image.
What is a CR system?
This device is an image digitization system designed to acquire and digitize x-ray images from image storage phosphor plates. A CR system consists of an image reader/digitizer, cassettes containing imaging receptors (photostimulable-phosphor plates), a computer console or workstation, software, monitors, and a printer.
What are the advantages of digital radiography?
Digital Radiography Advantages: Reducing Cost and Space Reduced radiation. Reduced cost due to the elimination of chemical processors, processor maintenance, and filing and mailing jackets. Reduced space requirement — no dark room is required, and the need to dedicate space for cabinets of analog images is eliminated.
How is digital radiography used?
Digital radiography (DR) is an advanced form of x-ray inspection which produces a digital radiographic image instantly on a computer. This technique uses x-ray sensitive plates to capture data during object examination, which is immediately transferred to a computer without the use of an intermediate cassette.
What are the advantages of computed radiography?
Today’s CR equipment produces high-quality, high-resolution images that are significantly more precise than those captured on film. CR plates offer a greater dynamic range as compared to film, allowing a broader in-depth evaluation of the material.
What are the disadvantages of digital radiography?
The main disadvantages of direct digital radiography are the thickness and rigidity of the digital detector, infection control, hardware and software maintenance, and the higher initial cost of the system.
What is the difference between direct and indirect digital radiography?
“Direct digital” refers to sensors that send a digital image directly to a computer and is also knows as DR or digital radiography. “Indirect digital” uses reusable phosphor coated plates that are run through a scanner to obtain the digital image which is then sent to the computer.
When was computed radiography invented?
1980s
What are the two types of direct readout digital radiography?
There are two types: Indirect DR: x-ray → stored electrons → light photons → readout electronics. Direct DR: x-ray → charge → readout electronics.
How is digital radiography spatial resolution controlled?
how is digital radiography spatial resolution controlled? to generate a histogram, the scanned area is divided into pixels and the signal intensity for each pixel is determined. The shape of the histogram will correspond to the specific anatomy and technique used for an exam.
What are the advantages of computed radiography over conventional radiography?
Advantages of computed radiography compared with conventional film/screen combinations include improved contrast resolution and postprocessing capabilities. Computed radiography’s spatial resolution is inferior to conventional radiography; however, this limitation is considered clinically insignificant.
What is DR in radiology?
Digital radiography (DR) is the direct conversion of transmitted X-ray photons into a digital image using an array of solid-state detectors such as amorphous selenium or silicon, with computer processing and display of the image.
What is XRAY wavelength?
0.01 to 10 nanometers
What is the shortest wavelength?
Gamma Radiation has the shortest wavelength. Gamma has the shortest wavelength because it has a higher frequency, meaning more waves in a second than any other radiation, which results in the short wavelength.
What is the wavelength of ultraviolet light?
The UV region covers the wavelength range 100-400 nm and is divided into three bands: UVA (315-400 nm) UVB (280-315 nm) UVC (100-280 nm).
Which wavelength has the most energy?
Gamma rays
Which wavelength is the most dangerous?
Ultraviolet
Which has higher frequency red or violet?
Red light has relatively long waves, around 700 nm long. Blue and purple light have short waves, around 400 nm. Shorter waves vibrate at higher frequencies and have higher energies. Red light has a frequency around 430 terahertz, while blue’s frequency is closer to 750 terahertz.
Does violet or red light travel faster?
Violet travels the slowest so it is on the bottom and red travels the fastest so is on the top. This is because what is called the index of refraction, (the ratio of the speed of light in a vacuum to the speed of light in a material), is increased for the slower moving waves (i.e. violet).
Why do we see red sunsets?
Within the visible range of light, red light waves are scattered the least by atmospheric gas molecules. So at sunrise and sunset, when the sunlight travels a long path through the atmosphere to reach our eyes, the blue light has been mostly removed, leaving mostly red and yellow light remaining.
Which photon is more energetic red or violet Why?
Solution : Since frequency of violet light is more than that of red light, i.e., vviolet>vred and energy of a photon = hv. So photon of violet light is more energetic than that of red light.