1.Normalize product registration standard of digital mammography system.
Yujing ZHANG ; Zhicheng LIU ; Zhiyong SUN
Chinese Journal of Medical Instrumentation 2012;36(2):125-148
This paper aims to discuss the issues needed to be considered during the process of defining the registered product standards and industry standards of digital mammographic X-ray camera system. Meanwhile, for the future reference of establishment of standards, it adds the additional technical requirements not only from the features of device's structure, but also from the risk of clinical use.
Mammography
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instrumentation
;
standards
;
Radiographic Image Enhancement
;
instrumentation
2.Application of Pareto Analysis in Studying DR High Fault Rate.
Chinese Journal of Medical Instrumentation 2019;43(2):154-156
OBJECTIVE:
To explore the effect of Pareto analysis on the investigation of DR (Digital Radiography) high fault rate.
METHODS:
The quality control team was established to analyze the causes of DR high fault rate by using the fault statistics of eight DR in our hospital for nearly three years,and to formulate and implement countermeasures,then compare them with the data after rectification.
RESULTS:
After three months of implementation,the number of DR faults in our hospital decreased from 130 times/quarter to 47 times/quarter,a year-on-year drop was 63.8%.Among them,the number of console faults decreased from 105 times/quarter to 25 times/quarter,a year-on-year drop was 76.2%,close to 80%.
CONCLUSIONS
Pareto analysis is effective in reducing DR fault rate and is worthy of being promoted to other medical devices.
Humans
;
Radiographic Image Enhancement
;
instrumentation
;
standards
3.Research on the Evaluation System of Clinical Value of Digital Radiography.
Fan BI ; Bin LI ; Houde CAO ; Haisheng HU ; Wenyong TU
Chinese Journal of Medical Instrumentation 2019;43(2):146-149
OBJECTIVE:
To establish a set of evaluation system of digital radiography clinical value and provide foundation for the maturity assessment of digital radiography.
METHODS:
The evaluation system of clinical value of digital radiography was established by literature survey,expert consultation,and percentage weight method.
RESULTS:
The expert authority coefficients were 0.81 and 0.88,respectively.After two rounds of consultation,variation coefficients of each item ranged from 0 to 0.207,and the coefficient coordination were 0.599.The index system consisted of 5 first-level indexes and 12 second-level indexes.The weights of first-level indexes such as image quality,safety,usability,economic and social indicators share of the weight are 0.298,0.294,0.199,0.121 and 0.088 respectively.
CONCLUSIONS
A completed and scientific evaluation system was established,which provides a scientific assessment tool for clinical value of digital radiography.
Delphi Technique
;
Radiographic Image Enhancement
;
standards
4.Optimization of digital chest radiography image post-processing in diagnosis of pneumoconiosis.
Bing-yong SHENG ; Ling MAO ; Shao-wei ZHOU ; Jin SHI
Chinese Journal of Industrial Hygiene and Occupational Diseases 2013;31(11):825-829
OBJECTIVETo establish the optimal image post-processing parameters for digital chest radiography as preliminary research for introducing digital radiography (DR) to pneumoconiosis diagnosis in China.
METHODSA total of 204 pneumoconiosis patients and 31 dust-exposed workers were enrolled as the subjects in this research. Film-screen radiography (FSR) and DR images were taken for all subjects. DR films were printed after raw images were processed and parameters were altered using DR workstation (GE Healthcare, U.S.A.). Image gradations, lung textures, and the imaging of thoracic vertebra were evaluated by pneumoconiosis experts, and the optimal post-processing parameters were selected. Optical density was measured for both DR films and FSR films.
RESULTSFor the DR machine used in this research, the contrast adjustment (CA) and brightness adjustment (BA) were the main parameters that determine the brightness and gray levels of images. The optimal ranges for CA and BA were 115%∼120% and 160%∼165%, respectively. The quality of DR chest films would be optimized when tissue contrast was adjusted to a maximum of 0.15, edge to a minimum of 1, and both noise reduction and tissue equalization to0.The failure rate of chest DR (0.4%) was significantly lower than that of chest FSR (17%) (P < 0.05).
CONCLUSIONAfter appropriate image post-processing on DR machine purchased from GE Healthcare, the DR chest films can meet all requirements for the quality of chest X-ray films in the Chinese diagnostic criteria for pneumoconiosis.
Humans ; Image Processing, Computer-Assisted ; methods ; Pneumoconiosis ; diagnostic imaging ; Radiographic Image Enhancement ; standards ; X-Ray Film
5.Digital Breast Tomosynthesis Mammography System Registration Application Data Technical Review Concerns.
Yujing ZHANG ; Lu LIU ; Wei XU
Chinese Journal of Medical Instrumentation 2019;43(4):290-293
In this paper, the focus of technical review of the registration application data of digital Breast Tomosynthesis Mammography System was sorted out, so as to provide reference for researchers and manufacturers in China when applying for registration and preparation of such products.
Breast
;
diagnostic imaging
;
Breast Neoplasms
;
diagnostic imaging
;
China
;
Humans
;
Mammography
;
instrumentation
;
standards
;
Radiographic Image Enhancement
;
standards
;
Risk Factors
6.Optimizing Imaging Quality and Radiation Dose by the Age-Dependent Setting of Tube Voltage in Pediatric Chest Digital Radiography.
Hui GUO ; Wen Ya LIU ; Xiao Ye HE ; Xiao Shan ZHOU ; Qun Li ZENG ; Bai Yan LI
Korean Journal of Radiology 2013;14(1):126-131
OBJECTIVE: The quality and radiation dose of different tube voltage sets for chest digital radiography (DR) were compared in a series of pediatric age groups. MATERIALS AND METHODS: Forty-five hundred children aged 0-14 years (yr) were randomly divided into four groups according to the tube voltage protocols for chest DR: lower kilovoltage potential (kVp) (A), intermediate kVp (B), and higher kVp (C) groups, and the fixed high kVp group (controls). The results were analyzed among five different age groups (0-1 yr, 1-3 yr, 3-7 yr, 7-11 yr and 11-14 yr). The dose area product (DAP) and visual grading analysis score (VGAS) were determined and compared by using one-way analysis of variance. RESULTS: The mean DAP of protocol C was significantly lower as compared with protocols A, B and controls (p < 0.05). DAP was higher in protocol A than the controls (p <0.001), but it was not statistically significantly different between B and the controls (p = 0.976). Mean VGAS was lower in the controls than all three protocols (p < 0.001 for all). Mean VGAS did not differ between protocols A and B (p = 0.334), but was lower in protocol C than A (p = 0.008) and B (p = 0.049). CONCLUSION: Protocol C (higher kVp) may help optimize the trade-off between radiation dose and image quality, and it may be acceptable for use in a pediatric age group from these results.
Adolescent
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Age Factors
;
Analysis of Variance
;
Child
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Child, Preschool
;
Humans
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Infant
;
Infant, Newborn
;
Pediatrics/*standards
;
Prospective Studies
;
*Radiation Dosage
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Radiation Protection/standards
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Radiographic Image Enhancement/*standards
;
Radiography, Thoracic/*standards
7.Research on DICOM SR.
Journal of Biomedical Engineering 2011;28(1):45-48
This paper is aimed to research into the information model of the Digital Imaging and Communication in Medicine (DICOM) Structured Reporting (SR), and to introduce DICOM information object definitions (IODs) and services used for the storage and transmission of SR. The DICOM services are concerned with storage, query, retrieval, and transfer of data, and give a brief introduction to DICOM DIR. DICOM DIR is a file based on medical information. According to the DICOM DIR definition in the DICOM part ten, it may be found that the composite objects referenced in the DICOM SR. So putting forward the management of DICOM files by DICOM DIR sets, It effectively improves the efficiency of the object referenced by SR. This can increase the ability to access the data. For scientific research, medical data mining and applications, DICOM SR can profit the communication of medical information in different hospitals, and this can be useful for the analysis, research, summary, classification and extraction of a large quantity of medical information.
Computer Communication Networks
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Humans
;
Information Storage and Retrieval
;
methods
;
standards
;
Medical Records Systems, Computerized
;
standards
;
Radiographic Image Enhancement
;
methods
;
Radiology Information Systems
;
organization & administration
;
User-Computer Interface
8.Investigation of simple Wiener spectrum measurement in medical imaging systems.
Zhi-Kang WANG ; Song ZHAO ; Jun-Yi ZHANG ; Wei-Min ZHANG
Chinese Journal of Medical Instrumentation 2006;30(2):136-138
This paper is to approach a simple method for Wiener spectrum measurement in different medial imaging systems. The program written in VC++6.0 can be used to obtain the density datum as discrete signals by scanning films on AGFA DUOSCAN T2000XL scanner, then WS values can be calculated by using fast Fourier transform. The method is applied to different x-ray photographs and the WS values are consistent with the known datum from MD-100 micro-densimeter. The method can make automatic data collection and procedural calculation, showing the characteristics of its simplicity and high speed.
Algorithms
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Fourier Analysis
;
Image Processing, Computer-Assisted
;
instrumentation
;
methods
;
Quality Control
;
Radiographic Image Enhancement
;
instrumentation
;
methods
;
Radiographic Image Interpretation, Computer-Assisted
;
methods
;
Radiography
;
Radiology Information Systems
;
standards
;
X-Ray Film
9.An electronic medical record information system of DICOM-RT module-based in radiation therapy.
Deguo XIA ; Linghong ZHOU ; Li LEI
Journal of Biomedical Engineering 2012;29(3):424-428
Electronic medical records (EMR) is the clinical diagnosis, guiding intervention and digital medical service record of outpatient, hospital patients (or care object) in medical institution. And it is the complete, detailed clinical information resource which has produced and recorded in all previous medical treatments. Radiotherapy electronic medical records contain texts, images and graphics, therefore the information is more complicated. This paper proposes an EMR information system based on DICOM-RT standard, through the use of seven objects of DICOM-RT to achieve the information exchange and sharing between different systems, equipments, convenient radiotherapy treatment data management, improve the efficiency of radiation treatment.
Computer Communication Networks
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Humans
;
Medical Records Systems, Computerized
;
standards
;
Radiographic Image Enhancement
;
methods
;
Radiology Information Systems
;
organization & administration
;
Radiotherapy, Computer-Assisted
;
methods
;
User-Computer Interface
10.Development of Standard Digital Images for Pneumoconiosis.
Won Jeong LEE ; Byung Soon CHOI ; Sung Jin KIM ; Choong Ki PARK ; Jai Soung PARK ; Seok TAE ; Kurt Georg HERING
Journal of Korean Medical Science 2011;26(11):1403-1408
We developed the standard digital images (SDIs) to be used in the classification and recognition of pneumoconiosis. From July 3, 2006 through August 31, 2007, 531 retired male workers exposed to inorganic dust were examined by digital (DR) and analog radiography (AR) on the same day, after being approved by our institutional review board and obtaining informed consent from all participants. All images were twice classified according to the International Labour Office (ILO) 2000 guidelines with reference to ILO standard analog radiographs (SARs) by four chest radiologists. After consensus reading on 349 digital images matched with the first selected analog images, 120 digital images were selected as the SDIs that considered the distribution of pneumoconiosis findings. Images with profusion category 0/1, 1, 2, and 3 were 12, 50, 40, and 15, respectively, and a large opacity were in 43 images (A = 20, B = 22, C = 1). Among pleural abnormality, costophrenic angle obliteration, pleural plaque and thickening were in 11 (9.2%), 31 (25.8%), and 9 (7.5%) images, respectively. Twenty-one of 29 symbols were present except cp, ef, ho, id, me, pa, ra, and rp. A set of 120 SDIs had more various pneumoconiosis findings than ILO SARs that were developed from adequate methods. It can be used as digital reference images for the recognition and classification of pneumoconiosis.
Adult
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Aged
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Aged, 80 and over
;
Dust
;
Humans
;
Lung/*pathology/*radiography
;
Male
;
Middle Aged
;
Occupational Exposure
;
Pleura/radiography
;
Pneumoconiosis/*radiography
;
Radiographic Image Enhancement/*standards