This paper exploits the Rayleigh integral method to simulate the propagation of transmitted ultrasonic waves and received echoes through various media. Performed simulations study the effect of apodization using diffe...This paper exploits the Rayleigh integral method to simulate the propagation of transmitted ultrasonic waves and received echoes through various media. Performed simulations study the effect of apodization using different types of windows and the effect of medium properties on the reflections obtained. All estimations are done using the Rayleigh integral method simplified by the Fresnel approximation. Five different interfaces are considered： tissue-bone-tissue, tissue-fat-bone, fat-muscle-bone, air-fat-bone and water-fat-bone. The apodization simulations show that the hamming window is more efficient than the rectangular and triangular windows for obtaining a more consistent beam. In the second set of simulations, reflections are mapped with respect to the depth from which these reflections are generated. It demonstrates that the solid and water media allow for the attainment of echoes from deeper regions as compared to the air medium. Matlab is used as the simulation framework.展开更多
The application of ultrasound techniques to monitor the condition of structures is becoming more prominent because these techniques can detect the early symptoms of defects such as cracks and other defects.The early d...The application of ultrasound techniques to monitor the condition of structures is becoming more prominent because these techniques can detect the early symptoms of defects such as cracks and other defects.The early detection of defects is of vital importance to avoid major failures with catastrophic consequences.An assessment of an ultrasound technique was used to investigate fatigue damage behaviour.Fatigue tests were performed according to the ASTM E466-96 standard with the attachment of an ultrasound sensor to the test specimen.AISI 1045 carbon steel was used due to its wide application in the automotive industry.A fatigue test was performed under constant loading stress at a sampling frequency of 8 Hz.Two sets of data acquisition systems were used to collect the fatigue strain signals and ultrasound signals.All of the signals were edited and analysed using a signal processing approach.Two methods were used to evaluate the signals,the integrated Kurtosis-based algorithm for z-filter technique(I-kaz) and the short-time Fourier transform(STFT).The fatigue damage behaviour was observed from the initial stage until the last stage of the fatigue test.The results of the I-kaz coefficient and the STFT spectrum were used to explain and describe the behaviour of the fatigue damage.I-kaz coefficients were ranged from 60 to 61 for strain signals and ranged from 5 to 76 for ultrasound signals.I-kaz values tend to be high at failure point due to high amplitude of respective signals.STFT spectrogram displays the colour intensity which represents the damage severity of the strain signals.I-kaz technique is found very useful and capable in assessing both stationary and non-stationary signals while STFT technique is suitable only for non-stationary signals by displaying its spectrogram.展开更多
The design of a universal waveform generator derived from displaying driving applications using floating power and Miller integrator circuit is introduced first. Then, the feasibility of driving ultrasound transducers...The design of a universal waveform generator derived from displaying driving applications using floating power and Miller integrator circuit is introduced first. Then, the feasibility of driving ultrasound transducers is verified by the test of the circuit and compared with other specific design of pulse generator for ultrasound driving purpose.展开更多
目的观察中西医结合治疗恶性淋巴瘤前后超声造影灌注的动态变化。方法10例恶性淋巴瘤患者经不同周期中西医结合治疗后对21个病变淋巴结(颈部、髂血管旁、后腹膜)和7个脾浸润病灶进行超声造影观察,分析其造影增强的图像特点。结果淋巴结...目的观察中西医结合治疗恶性淋巴瘤前后超声造影灌注的动态变化。方法10例恶性淋巴瘤患者经不同周期中西医结合治疗后对21个病变淋巴结(颈部、髂血管旁、后腹膜)和7个脾浸润病灶进行超声造影观察,分析其造影增强的图像特点。结果淋巴结病灶治疗前后彩色多普勒血流显像方法(CD F I)示血流分布类型及连续增强超声造影(CEUS)增强分布方式均有明显差异(P<0.05);脾脏病灶治疗前后CEUS增强方式分布有明显差异(P<0.05)。结论超声造影能有效地用于恶性淋巴瘤中西医结合治疗后随访并指导后续治疗。展开更多
目的探讨医护患一体化护理模式在高强度超声聚焦治疗子宫腺肌病患者的围术期疼痛管理中的应用效果。方法选取首都医科大学附属北京妇产医院妇科微创中心2016年5月—2019年5月收治的子宫腺肌病并接受高强度聚焦超声(HIFU)治疗的患者102例...目的探讨医护患一体化护理模式在高强度超声聚焦治疗子宫腺肌病患者的围术期疼痛管理中的应用效果。方法选取首都医科大学附属北京妇产医院妇科微创中心2016年5月—2019年5月收治的子宫腺肌病并接受高强度聚焦超声(HIFU)治疗的患者102例,通过计算机随机分为研究组和对照组,并实施分组护理。对照组51例应用常规护理模式,研究组51例采用医护患一体化护理模式对围术期疼痛进行联合管理。比较两组患者术后疼痛评分、镇痛药物使用情况、焦虑度以及护理满意度护理效果。结果两组术后2 h视觉模拟评分(VAS)比较,差异无统计学意义(P>0.05)。两组术后24 h VAS均显著性低于术后2 h,且研究组低于对照组,差异有统计学意义(P<0.05或P<0.01)。研究组焦虑评分低于对照组,研究组术后使用镇痛药物患者比例低于对照组,差异有统计学意义(P<0.05)。研究组护理满意度高于对照组,差异有高度统计学意义(P<0.01)。结论对接受高强度聚焦超声治疗的子宫腺肌病患者实施医护患一体化疼痛管理模式,可以有效帮助患者正确解读及评价治疗中所产生的疼痛,从而提高护理疼痛管理水平,缓解患者术后疼痛、焦虑,减少药物使用以及提高患者满意度。展开更多
文摘This paper exploits the Rayleigh integral method to simulate the propagation of transmitted ultrasonic waves and received echoes through various media. Performed simulations study the effect of apodization using different types of windows and the effect of medium properties on the reflections obtained. All estimations are done using the Rayleigh integral method simplified by the Fresnel approximation. Five different interfaces are considered： tissue-bone-tissue, tissue-fat-bone, fat-muscle-bone, air-fat-bone and water-fat-bone. The apodization simulations show that the hamming window is more efficient than the rectangular and triangular windows for obtaining a more consistent beam. In the second set of simulations, reflections are mapped with respect to the depth from which these reflections are generated. It demonstrates that the solid and water media allow for the attainment of echoes from deeper regions as compared to the air medium. Matlab is used as the simulation framework.
基金Projects(UKM-KK-03-FRGS0118-2010,UKM-OUP-NBT-28-135/2011)supported by FRGS Universiti Kebangsaan Malaysia,Malaysia
文摘The application of ultrasound techniques to monitor the condition of structures is becoming more prominent because these techniques can detect the early symptoms of defects such as cracks and other defects.The early detection of defects is of vital importance to avoid major failures with catastrophic consequences.An assessment of an ultrasound technique was used to investigate fatigue damage behaviour.Fatigue tests were performed according to the ASTM E466-96 standard with the attachment of an ultrasound sensor to the test specimen.AISI 1045 carbon steel was used due to its wide application in the automotive industry.A fatigue test was performed under constant loading stress at a sampling frequency of 8 Hz.Two sets of data acquisition systems were used to collect the fatigue strain signals and ultrasound signals.All of the signals were edited and analysed using a signal processing approach.Two methods were used to evaluate the signals,the integrated Kurtosis-based algorithm for z-filter technique(I-kaz) and the short-time Fourier transform(STFT).The fatigue damage behaviour was observed from the initial stage until the last stage of the fatigue test.The results of the I-kaz coefficient and the STFT spectrum were used to explain and describe the behaviour of the fatigue damage.I-kaz coefficients were ranged from 60 to 61 for strain signals and ranged from 5 to 76 for ultrasound signals.I-kaz values tend to be high at failure point due to high amplitude of respective signals.STFT spectrogram displays the colour intensity which represents the damage severity of the strain signals.I-kaz technique is found very useful and capable in assessing both stationary and non-stationary signals while STFT technique is suitable only for non-stationary signals by displaying its spectrogram.
文摘The design of a universal waveform generator derived from displaying driving applications using floating power and Miller integrator circuit is introduced first. Then, the feasibility of driving ultrasound transducers is verified by the test of the circuit and compared with other specific design of pulse generator for ultrasound driving purpose.
文摘目的观察中西医结合治疗恶性淋巴瘤前后超声造影灌注的动态变化。方法10例恶性淋巴瘤患者经不同周期中西医结合治疗后对21个病变淋巴结(颈部、髂血管旁、后腹膜)和7个脾浸润病灶进行超声造影观察,分析其造影增强的图像特点。结果淋巴结病灶治疗前后彩色多普勒血流显像方法(CD F I)示血流分布类型及连续增强超声造影(CEUS)增强分布方式均有明显差异(P<0.05);脾脏病灶治疗前后CEUS增强方式分布有明显差异(P<0.05)。结论超声造影能有效地用于恶性淋巴瘤中西医结合治疗后随访并指导后续治疗。
文摘目的探讨医护患一体化护理模式在高强度超声聚焦治疗子宫腺肌病患者的围术期疼痛管理中的应用效果。方法选取首都医科大学附属北京妇产医院妇科微创中心2016年5月—2019年5月收治的子宫腺肌病并接受高强度聚焦超声(HIFU)治疗的患者102例,通过计算机随机分为研究组和对照组,并实施分组护理。对照组51例应用常规护理模式,研究组51例采用医护患一体化护理模式对围术期疼痛进行联合管理。比较两组患者术后疼痛评分、镇痛药物使用情况、焦虑度以及护理满意度护理效果。结果两组术后2 h视觉模拟评分(VAS)比较,差异无统计学意义(P>0.05)。两组术后24 h VAS均显著性低于术后2 h,且研究组低于对照组,差异有统计学意义(P<0.05或P<0.01)。研究组焦虑评分低于对照组,研究组术后使用镇痛药物患者比例低于对照组,差异有统计学意义(P<0.05)。研究组护理满意度高于对照组,差异有高度统计学意义(P<0.01)。结论对接受高强度聚焦超声治疗的子宫腺肌病患者实施医护患一体化疼痛管理模式,可以有效帮助患者正确解读及评价治疗中所产生的疼痛,从而提高护理疼痛管理水平,缓解患者术后疼痛、焦虑,减少药物使用以及提高患者满意度。
