Right atrial angiosarcoma and electrocardiogram-gated cardiac computed tomography:a case report

Primary cardiac tumors are quite rare and most of these tumors are benign.In this report,a patient presented with chest distress and shortness of breath after activity.Echocardiography of other hospital showed a hyperechoic right atrial mass.Electrocardiogram-gated cardiac computed tomography(ECG-Gated CT) of our hospital provided accurate information about the site and extent of the tumor,and the involvement of neighboring structures,even about the malignant nature of the lesion.The pathological study indicated angiosarcoma.The role of ECG-Gated CT in the assessment of cardiac masses and tumors was discussed.Cardiac tumors are extremely rare and can be divided into benign and malignant lesions.Myxomas are the most common type of cardiac benign tumor,while angiosarcomas are the most common type of cardiac malignant tumor.Imaging studies play an important role in the diagnosis of cardiac angiosarcomas.Echocardiogram,computed tomography(CT) and magnetic resonance imaging(MRI) are the most common imaging studies for tumors evaluation.However,the precise tumor location is often difficult to evaluate precisely on the basis of two-dimensional source images.We conducted ECG-gated cardiac CT examination with 3D reconstruction for preoperative assessment in a patient with a angiosarcoma arising in the right atrium.

Monitoring the ionosphere based on the Crustal Movement Observation Network of China

The Global Navigation Satellite System （GNSS） is becoming important for monitoring the variations in the earth＇s ionosphere based on the total electron content （TEC） and iono- spheric electron density （IED）. The Crustal Movement Observation Network of China （CMONOC）, which includes GNSS stations across China's Mainland, enables the continuous monitoring of the ionosphere over China as accurately as possible. A series of approaches for GNSS-based ionospheric remote sensing and software has been proposed and devel- oped by the Institute of Geodesy and Geophysics （IGG） in Wuhan. Related achievements include the retrieval of ionospheric observables from raw GNSS data, differential code biases estimations in satellites and receivers, models of local and regional ionospheric TEC, and algorithms of ionospheric tomography. Based on these achievements, a software for processing GNSS data to determine the variations in ionospheric TEC and IED over China has been designed and developed by IGG. This software has also been installed at the CMONOC data centers belonging to the China Earthquake Administration and China Meteorological Administration. This paper briefly introduces the related research achievements and indicates potential directions of future work.

Biomedical X-ray Imaging Enabled by Carbon Nanotube X-ray Sources

Although discovered more than 100 years ago, X-ray source technology has evolved rather slowly. The recent invention of the carbon nanotube （CNT） X-ray source technology holds great promise to revolutionize the field of biomedical X-ray imaging. CNT X-ray sources have been successfully adapted to several biomedical imaging applications including dynamic rnicro-CT of small animals and stationary breast tomosynthesis of breast cancers. Yet their more irnportant biomedical imaging applications still lie ahead in the future, with the devel- oprnent of stationary rnulti-source CT as a noteworthy exarnple.

Deriving the three-dimensional structure of ZnO nanowires/nanobelts by scanning transmission electron microscope tomography

Characterizing the three-dimensional （3D） shape of a nanostructure by con- ventional imaging techniques in scanning electron microscopy and transmission electron microscopy can be limited or complicated by various factors, such as two-dimensional （2D） projection, diffraction contrast and unsure orientation of the nanostructure with respect to the electron beam direction. In this paper, in conjunction with electron diffraction and imaging, the 3D morphologies of ZnO nanowires and nanobelts synthesized via vapor deposition were reconstructed by electron tomography in a scanning transmission electron microscope （STEM）. The cross-sections of these one-dimensional （1D） nanostructures include triangle, hexagonal, and rectangle shapes. By combining the reconstructed shape with the crystalline information supplied by electron diffraction patterns recorded from the same nanowire/nanobelt, the growth direction and its exposed surfaces were uniquely identified. In total, three different growth directions were confirmed. These directions are 〈 0001 〉, 〈21 10 〉 and 〈21 13 〉, corresponding to 〈001〉, 〈100〉 and 〈101〉 orientations in three-index notation. The 〈0001〉 growth nanowires show triangle or hexagonal cross-sections, with exposed {01]-0} side surfaces. The dominant surfaces of the 〈21 10〉 growth nanobelt are _＋（0001） planes. Both hexagonal and rectangle cross-sections were observed in the 〈 2]-13 〉 growth ZnO nanostructures. Their surfaces include the {01]-0}, {]-101} and {2112} planes. The nanobelts with a large aspect ratio of ~10 normally grow along the 〈 21 10 〉 direction, while nanobelts with small aspect ratio grow along 〈21 13 〉 growth direction. The approach and methodology demonstrated here can be extended to any nanostructures that even amorphous. can be crystalline, polycrystalline or

Study on Heart-protecting Musk Pill (麝香保心丸)in Improving Myocardial IschemiaEvaluated by Nuclear Myocardial Imaging

The effect of Heart-protecting Musk Pill(HMP) on blood perfusion of the ischemic myocardi-um by intravenous dipyridamole 99mTc-sestamibi single photon emission computerized tomography (99mTc-MIBISPECT) in 17 patients with coronary heart disease was observed. Results showed that sublingual admin-istration of HMP prior to injection of dipyridamole could remit the cardiac symptoms induced by dipyridamole,such as angina, chest distress, etc. with a remission rate of 85% . HMP could also improve the SPECT imagedefect significantly, 8 of 11 cases with reversible image defects and 4 of 6 irreversible image defects wereimproved. It suggested that HMP could improve the blood perfusion of the ischemic myocardium, the total ef-fective rate was70 . 59 % . No adverse reaction was found.