Comparison between the hottest digital image and t

2022-08-23
  • Detail

Comparison between digital image and traditional radiography

traditional radiography is the earliest and most common application in the field of medicine. It has been more than 100 years since roentgen, a German scientist, discovered X-ray in 1895. In the field of medical imaging, CT, MRI, DSA ultrasound have successively realized the digitization of images, while in traditional X-ray photography, it is the latest to realize the digitization of image information. In 1983, Fuji company of Japan first launched the storage phosphor CR system, which took the lead in clinical application, thus solving the problem of digitization of conventional X-ray photography. In 1997, the green development of flying in the Netherlands also attracted the attention of refractories and related industries. Lipp launched the world's first direct digital X-ray photography equipment digital imaging (DR) system, which laid the foundation for the full realization of image digitization in medical photography

1 acquisition method and comparison between DR and traditional X-ray image

dr is a physical pattern completely represented by a set of regular digital quantities. The characteristics of digital image are: large gray scale dynamic range, relatively high density resolution, good linearity, rich levels; Post processing is available; The radiation dose is small. Analog image (traditional X-ray image) is an intuitive physical quantity to continuously and vividly show another physical characteristic pattern. Its characteristics are: continuous, intuitive and convenient to obtain; The image performance has the characteristics of generality and real-time dynamic acquisition, but the repeatability of the simulated image is poor. On the one hand, the imaging cannot be changed or post processed; The dynamic range of gray scale is small

1 in many scientific research experiments 1 digital imaging and traditional X-ray have also won the favor of many well-known automobile and bus manufacturers. The comparison of different detection methods (see table I) table I comparison of digital imaging and traditional X-ray detection methods

1.2 comparison of digital imaging and traditional X-ray imaging see Table II

2 clinical application of Dr better than traditional X-ray

the diagnostic basis of DR is basically consistent with traditional X-ray plain film, However, the post-processing of digital images obviously expands the scope of diagnosis. This is the comparison between traditional screen glue system Table II digital imaging and traditional X-ray imaging. The chest is the most suitable part for Dr. There are great differences in chest tissue density, and different post-processing is more conducive to the discovery of lesions, especially those in the overlapping part of the inferior mediastinal ribs after mediastinal cardiogram. Dr obviously expands the scope that cannot be covered by conventional chest radiographs. In particular, chest physical examination is fast, clear and accurate

head and neck and bone joint imaging DR can observe the anatomical structure of the obtained image with different window width and window position according to the different X-ray absorption rate. Not only the fine structure of bone can be well observed, but also the head and neck tissue, nasopharyngeal and tracheal tissue can be observed. Bone changes can be observed in the joint position. After treatment, articular cartilage, tendons, ligaments, joint capsules Changes of subcutaneous fat and skin soft tissue. Through local amplification, we can better observe the structural details

energy subtraction is an advanced application of DR in chest examination. It can continuously collect high-energy signals and low-energy signals within a time interval of 200 ms. three kinds of chest images can be obtained by one exposure: standard chest radiography; Lung tissue image with ribs removed, chest rib image. Its characteristics are: the small nodules of lung tissue can be well displayed; It is beneficial to observe the anatomical variation of trachea and bronchus; Improve the diagnosis of pulmonary vascular disease; Improve the diagnostic effect of pneumothorax; It is beneficial to observe rib lesions

for abdominal diseases such as free gas, intestinal obstruction, urinary calculi and calcification, the resolution of soft tissue and the ability to display small lesions can be increased through post-processing. The contrast examination of abdominal organs can also improve the resolution of micro structures

3 DR is superior to the main characteristics of traditional X-ray

improves the image quality and significantly reduces the exposure conditions, such as the chest posterior anterior position, which is generally between 120 kV, 200 Ma, 20 ms ~ 29 MS, 4 MAS ~ 5 MAS, which is significantly lower than the standard formulated by CEC. At the same time, the dynamic range is increased by more than 40 times

the imaging speed is fast, the acquisition time is less than 10 ms, and the imaging time of conventional photos is only 5 s. The radiographer immediately observes the image on the screen. It can be transferred to the post-processing workstation in a few seconds. Print laser film as required

energy subtraction enables people to separate bone tissue and cardiopulmonary tissue on ordinary X-ray films for the first time, which greatly improves the specific diagnosis of pulmonary nodules, and is also very helpful for the differential diagnosis of orthopedic trauma (such as fracture) and tumor. Energy subtraction will be one of the routine means of Radiology examination

because of the digital acquisition method, it has a strong post-processing ability, and provides the best digital platform for the hospital to realize networking. Because it takes into account the requirements of image quality and network transmission. With standard DICOM transmission/storage/printing, it is very convenient to connect RIS and his

it effectively solves the archiving management and transmission of images, and the use of optical disc recording has low cost and good economic benefits. It improves the working efficiency of the radiology department and increases the circulation of patients

in short, Dr brings us: high DQE, large tolerance, low exposure dose, high resolution, fast X-ray conversion efficiency, which reduces the labor intensity of Radiology Workers. In the future, with the development of computer technology, electronic technology and information technology, it will provide a broader space for the development of medical imaging. (end)

Copyright © 2011 JIN SHI