Four-dimensional cone beam CT (4D-CBCT) imaging can provide accurate location information of real-time breathing for imaging-guided radiotherapy. How to improve the accuracy of 4D-CBCT reconstruction image is a hot topic in current studies. PICCS algorithm performs remarkably in all 4D-CBCT reconstruction algorithms based on CS theory. The improved PICCS algorithm proposed in this paper improves the prior image on the basis of the traditional PICCS algorithm. According to the location information of each phase, the corresponding prior image is constructed, which completely eliminates the motion blur of the reconstructed image caused by the mismatch of the projection data. Meanwhile, the data fidelity model of the proposed method is consistent with the traditional PICCS algorithm. The experimental results showed that the reconstructed image using the proposed method had a clearer organization boundary compared with that of images reconstructed using the traditional PICCS algorithm. This proposed method significantly reduced the motion artifact and improved the image resolution.
Algorithms ; Cone-Beam Computed Tomography ; methods ; Four-Dimensional Computed Tomography ; Humans ; Image Processing, Computer-Assisted ; Organ Motion ; Radiographic Image Enhancement ; instrumentation ; methods ; Respiration

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

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

OBJECTIVE: To establish a cone beam computed tomography (ECBCT) system for high-resolution imaging of the extremities. METHODS: Based on three-dimensional X-Ray CT imaging and high-resolution flat plate detector technique, we constructed a physical model and a geometric model for ECBCT imaging, optimized the geometric calibration and image reconstruction methods, and established the scanner system. In the experiments, the pencil vase phantom, image quality (IQ) phantom and a swine feet were scanned using this imaging system to evaluate its effectiveness and stability. RESULTS: On the reconstructed image of the pencil vase phantom, the edges were well preserved with geometric calibrated parameters and no aliasing artifacts were observed. The reconstructed images of the IQ phantom showed a uniform distribution of the CT number, and the noise power spectra were stable in multiple scanning under the same condition. The reconstructed images of the swine feet had clearly displayed the bones with a good resolution. CONCLUSIONS The ECBCT system can be used for highresolution imaging of the extremities to provide important imaging information to assist in the diagnosis of bone diseases.
Algorithms ; Animals ; Artifacts ; Calibration ; Cone-Beam Computed Tomography ; instrumentation ; methods ; Equipment Design ; Extremities ; diagnostic imaging ; Image Processing, Computer-Assisted ; methods ; Phantoms, Imaging ; Radiographic Image Enhancement ; instrumentation ; methods ; Swine

BACKGROUND/AIMS: We aimed to evaluate the feasibility and efficacy of a forward-viewing linear endoscopic ultrasound (FV-EUS) in diagnostic EUS procedures compared to standard oblique-viewing EUS (OV-EUS). METHODS: This study was a prospective, randomized study that permitted crossover. Fifty-one patients with subepithelial pancreatobiliary and upper gastrointestinal lesions underwent FV-EUS and OV-EUS sequentially, in random order. The EUS visualization was performed by a novice endosonographer, and the image quality of specific lesions was scored by an expert endosonographer. If fine-needle aspiration (FNA) was indicated, it was performed using both echoendoscopes by an expert endosonographer. RESULTS: Both of the EUS procedures had similar visualization times and image quality. In general, the visualization time was inversely related to the diameter of the specific lesions. In subepithelial lesions of the stomach and duodenum, the visualization time (98.8+/-62.2 seconds vs 139.0+/-66.6 seconds, p=0.008) and image quality (4.1+/-1.3 vs 3.3+/-1.7, p=0.02) of FV-EUS were significantly superior to OV-EUS. FV-EUS-guided FNA of pancreatic masses was successful in seven patients (87.5%). CONCLUSIONS: FV-EUS may increase the ease of access to gastrointestinal subepithelial lesions compared to conventional OV-EUS. The performance of FV-EUS for evaluating pancreatobiliary diseases and performing interventions was comparable to conventional OV-EUS.
Aged ; Biliary Tract Neoplasms/*ultrasonography ; Cross-Over Studies ; Endosonography/*instrumentation/methods ; *Equipment Design ; Feasibility Studies ; Female ; Gastrointestinal Neoplasms/*ultrasonography ; Humans ; Image Enhancement/*instrumentation ; Male ; Middle Aged ; Pancreatic Neoplasms/*ultrasonography ; Prospective Studies

Humans ; Occupational Diseases ; prevention & control ; therapy ; Radiographic Image Enhancement ; instrumentation ; X-Rays

Using the Web Service technology, the paper puts forward a solution of remote communication between PACS and the handheld mobile intelligent devices, the characteristics of the solution are simple, easy to implement, short development cycle, high practicability, and low cost etc.
Artificial Intelligence ; Computer Communication Networks ; Computers, Handheld ; Image Enhancement ; instrumentation ; Internet ; Signal Processing, Computer-Assisted ; instrumentation ; Software

OBJECTIVETo explore the image quality of different tube voltage on digital chest radiograph for contrast detail phantom (CDRAD2.0) and occupational exposed workers.

METHODSThe CDRAD2.0 phantom DR images of high KV and different tube voltages were analyzed by 3 readers, image quality figure (IQF) were calculated and compared; at the same time 136 exposed workers were examined with high-kV and DR chest radiograph of different tube voltages. Contrast to high-KV images, 10 anatomic sites were scored .The image differences were compared between DR and high-kV.

RESULTSOn CDRAD2.0 phantom, the IQF value of DR images in 3 readers were minimum in the condition of 120 kV, average value was 22.25. The analysis of variance in model with random effects, the mean IQF value of different tube voltage DR image had a significant difference (F = 13.775, P<0.01); By Dunnett t-tests analysis, the mean IQF value of DR image in 120 kV and high kilovoltage had no difference (t = -0.58, P = 0.979); On clinical cases, the DR image of 120 kV showed the closest anatomy to the high KV, the mean had no significant difference with 0 (P > 0.05) with single sample t test.

CONCLUSIONOn the CDRAD2.0 phantom or clinical exposed workers, the DR image quality of 120 kV tube voltage equals to high-KV basically.

Adult ; Aged ; Dust ; Female ; Humans ; Male ; Middle Aged ; Occupational Exposure ; Radiographic Image Enhancement ; instrumentation ; methods ; Radiography, Thoracic ; instrumentation ; methods

OBJECTIVE: To compare the diagnostic performance of light emitting diode (LED) backlight monitors and cold cathode fluorescent lamp (CCFL) monitors for the interpretation of digital chest radiographs. MATERIALS AND METHODS: We selected 130 chest radiographs from health screening patients. The soft copy image data were randomly sorted and displayed on a 3.5 M LED (2560 x 1440 pixels) monitor and a 3 M CCFL (2048 x 1536 pixels) monitor. Eight radiologists rated their confidence in detecting nodules and abnormal interstitial lung markings (ILD). Low dose chest CT images were used as a reference standard. The performance of the monitor systems was assessed by analyzing 2080 observations and comparing them by multi-reader, multi-case receiver operating characteristic analysis. The observers reported visual fatigue and a sense of heat. Radiant heat and brightness of the monitors were measured. RESULTS: Measured brightness was 291 cd/m2 for the LED and 354 cd/m2 for the CCFL monitor. Area under curves for nodule detection were 0.721 +/- 0.072 and 0.764 +/- 0.098 for LED and CCFL (p = 0.173), whereas those for ILD were 0.871 +/- 0.073 and 0.844 +/- 0.068 (p = 0.145), respectively. There were no significant differences in interpretation time (p = 0.446) or fatigue score (p = 0.102) between the two monitors. Sense of heat was lower for the LED monitor (p = 0.024). The temperature elevation was 6.7degrees C for LED and 12.4degrees C for the CCFL monitor. CONCLUSION: Although the LED monitor had lower maximum brightness compared with the CCFL monitor, soft copy reading of the digital chest radiographs on LED and CCFL showed no difference in terms of diagnostic performance. In addition, LED emitted less heat.
Cold Temperature ; Data Display ; *Electrodes ; Equipment Design ; Humans ; *Image Interpretation, Computer-Assisted ; Lung Neoplasms/*radiography ; ROC Curve ; Radiographic Image Enhancement/*instrumentation ; Radiography, Thoracic/*instrumentation ; Retrospective Studies ; Tomography, X-Ray Computed/*instrumentation

The technology of electronic chromoendoscopy consists of narrow band imaging (NBI) and fuji intelligent chromo endoscopy (FICE). The two skills help distinguish between normal mucous membrane and focal zone and raise the detecting rate between the abnormal proliferation and early cancer. Therefore, the exploring research for type selection index of the two technologies and systems will be beneficial to the choice of the highest cost-effective endoscopy system and to the avoidance of wasting resources. By comparing all the indexes, and with purpose of clinical usage, NBI system has advantage over the FICE system. But with purpose for scientific research, the FICE system will be the better choice.
Capsule Endoscopy ; instrumentation ; Color ; Equipment Design ; Gastric Mucosa ; pathology ; Humans ; Image Enhancement ; methods ; Intestinal Mucosa ; pathology ; Intestinal Neoplasms ; diagnosis ; pathology ; Stomach Neoplasms ; diagnosis ; pathology