[en] Objective: To evaluate the use of computed tomographic angiography (CTA) in the screening of cerebral aneurysms. Methods: Twenty patients with un-ruptured cerebral aneurysms were examined by CT angiography and/or digital subtraction angiography (DSA). CTA was obtained using maximum intensity projection (MIP) reconstruction. 18 cases underwent surgery. The results were evaluated by DSA and the intraoperative findings. Results: Of the 20 patients, a total of 21 aneurysms wee detected by DSA and operation, and 20 aneurysms by CTA. 19 patients had 1 aneurysm, 1 patient had 2 (aneurysm of the posterior communicating artery were detected by DSA but not by CTA). The true positive diagnosis of aneurysms using CTA was 95% (20/21). Super-selective MIP (or target reconstruction) and combined use of MIP image and source image were necessary for exact diagnosis. Conclusion: The authors can diagnose un-ruptured cerebral aneurysm over 3.0 mm in size using CT angiography. CTA can be used in diagnosing, detecting, and following-up of intracranial aneurysms. The sensitivity of three-dimensional CTA is comparable with that of DSA, and it is simple, quick, noninvasive, reliable, and suitable for screening and diagnostic purposes

[en] Prediction of plasma disruption using artificial neural networks (ANN) has been investigated on HL-2A. Two methods have been adopted to train ANN. In the first one, the original experimental data are used directly as the ANN input. In the second one, in order to reduce the noise and enlarge the implicit disruption information in original Mirnov signal, the preprocessing is given in original Mirnov signal in the training subset. The prediction results indicate that the second method is more accurate and effective comparing with the first one. (authors)

[en] To decide the allowable error range of magnetic measurement system, it is assumed that the measurement errors of the magnetic probe and flux loop signals are characterized by a normal probability distribution on HL-2M. The input signals with errors are calculated using the EFIT code in fitting mode. The analysis results show that the good plasma configuration can be obtained if the measurement errors are lower than 4%. (authors)

[en] The HL-2A equilibrium reconstruction subsystem with grid dimension 33 × 33 didn't meet the control accuracy and speed for the HL-2M tokamak, so a new equilibrium reconstruction subsystem with grid dimension 129 × 129 was developed. This subsystem can run a time slice in 600 μs by solving the G-S function and reconstructing some algorithm of calculating some parameters and meet the requirements of the control system about real-time and accuracy on HL-2A and HL-2M tokamak. (authors)

[en] The simulation results of the plasma reconstruction were obtained and compared with the accurate balance results. With the introduction of random errors in the simulation process, robustness of the inversion procedure had been verified. The reconstruction results using the experimental data from EAST device had been compared with the inversion results from EAST's RTEFIT to verify the correctness of the results that a single time and the continuous-time inversion. The results show that, choosing the current distribution model and magnetic diagnostic data through the equilibrium reconstruction algorithm can correctly identify the plasma shape. (authors)

[en] The GPU parallel algorithms of the HL-2A plasma real-time equilibrium reconstruction including parallel processing of G-S equation, an algorithm solving the tri-diagonal linear system efficiently in parallel, the computation of the flux on grid boundary points and some parallel speed-up for middle-scale matrix multiplication on GPU, were introduced. After the parallelization, an equilibrium reconstruction iteration needs around 575 μs with a 129 × 129 grid. (authors)

[en] Objective: In order to explore the health status of the retired radiation workers in our institute, medical followup was performed on those who received large doses of radiation. Methods: A health survey and analysis on the physical fitness of 138 retired workers of the Institute of Radiation Medicine of the Chinese Academy of Medical Sciences (hereinafter referred to as the Institute of Radiology) was conducted, and the medical follow-up analysis of the large dose of 5 people according to the recommendations of GBZ/T163 was carried out. Results: The prevalence of radiation-related tumors was significantly higher in the five who received higher doses than in other retirees, and the patients who received higher doses than other retired radiation workers had basically the same conditions in the hematopoietic system, Immune System, endocrine system, reproductive system, and eye exams. Conclusions: The incidence rate of tumor in the workers who received high dose radiation was obviously higher than that of other retirees, and other health check-ups were basically the same. (authors)

[en] Objective: To evaluate the ability of excretory CT urography (CTU) in the application of the upper urinary tract in children by comparing with intravenous urography (IVU) and magnetic resonance urography (MRU) , and to evaluate the value of CTU in the diagnosis of various diseases on upper urinary tract in children. Methods: Sixty-two children suspected with upper urinary tract disease were imaged by CTU, 31 of them underwent IVU, and 13 of them underwent MRU, Each urinary tract was arbitrarily divided into five parts (calices, pelvis, upper, middle, and lower ureters) for scoring of images on a five-point scale for opacification by contrast material. Opacification scores for the two groups (normal and abnormal) of urinary tracts were then compared. Compared with IVU and MRU, CTU was evaluated in the diagnosis of upper urinary tract disease in children. Results: The score of IVU and CTU was higher than that of MRU for all parts of the normal urinary tracts (P < 0.01) . The score of CTU was higher than that of IVU and MRU for calices and pelvis of the abnormal urinary' tracts (P < 0.01 ) . Differences in scores for upper ureter were not statistically significant among IVU, CTU, and MRU. The score of CTU and MRU was higher than that of IVU for middle and lower ureters (P < 0.01). The accurate rate of CTU in diagnosing renal duplication and renal hypoplasia was 100% , which was higher than that of IVU and MRU. In diagnosing the hydronephrosis, CTU (100%) and MRU (100%) were better than IVU (62.5%); CTU was also more reliable in detecting the ectopic ureteral orifice, ureterocele, and severe renal injury than IVU and MRU. Conclusion: CTU is a reliable technique for the diagnosis of urinary tract diseases. If a child was suspected to have each of the following diseases by ultrasound examination, such as renal duplication, renal hypoplasia, and severe renal injury, CTU could be selected as the first choice

[en] In order to solve the problems of scattered layout of the data acquisition system and easily attenuated and interfered signals in the HL-2 M diagnostic equipment, a novel ethernet distributed data acquisition system and a management scheme are present. The acquisition module has an ethernet interface, which can be distributed in the remote distance and connected to the local area network easily. The functions of data acquisition, storage, upload and centralized management can be achieved in the centralized management system, which works in the client/server and different levels management mode, through using the technology of multi-thread socket network communication. The discharge experiment tests prove that the acquisition system has the characteristics of accurate measurement, strong anti-interference performance, fast speed data transmission, convenient deployment and management, and can satisfy the data requirement of plasma physics diagnosis system. (authors)

[en] This study presents a CMOS receiver chip realized in 0.18 μm standard CMOS technology and intended for high precision 3-D laser radar. The chip includes an adjustable gain transimpedance pre-amplifier, a post-amplifier and two timing comparators. An additional feedback is employed in the regulated cascode transimpedance amplifier to decrease the input impedance, and a variable gain transimpedance amplifier controlled by digital switches and analog multiplexer is utilized to realize four gain modes, extending the input dynamic range. The measurement shows that the highest transimpedance of the channel is 50 k $\mathrm{\Omega <!--\; ??\; -->}$, the uncompensated walk error is 1.44 ns in a wide linear dynamic range of 66 dB (1:2000), and the input referred noise current is 2.3 pA/$\sqrt{\mathrm{H}\mathrm{z}}$ (rms), resulting in a very low detectable input current of 1 μA with SNR = 5. (paper)