Estimation of bone quality on scoliotic subjects using ultrasound reflection imaging method - a preliminary study

2015 ◽  
Author(s):  
Rui Zheng ◽  
Lawrence H Le ◽  
Doug Hill ◽  
Edmond Lou
Keyword(s):  
Bone Quality ◽  
Imaging Method ◽  
Preliminary Study ◽  
Reflection Imaging

scholarly journals Curve flexibility assessment on AIS surgical candidates using ultrasonic imaging method - a preliminary study

Scoliosis ◽  
2015 ◽  
Vol 10 (S1) ◽  
Author(s):  
Edmond Lou ◽  
Rui Zheng ◽  
Lawrence Le ◽  
Doug Hill ◽  
Jim Raso ◽  
...  
Keyword(s):  
Ultrasonic Imaging ◽  
Imaging Method ◽  
Preliminary Study

A Preliminary Study of DXA and QCT Derived Femur Cross-Section Stiffness

2015 ◽  
Vol 775 ◽  
pp. 415-419
Author(s):  
Yun Hua Luo ◽  
Hui Juan Yang ◽  
Laura Targownik ◽  
Andrew Goertzen ◽  
William D. Leslie
Keyword(s):  
Cross Section ◽  
Bone Quality ◽  
Quantitative Computed Tomography ◽  
Heterogeneous Material ◽  
Dual Energy ◽  
Strong Correlations ◽  
X Ray ◽  
Study Results ◽  
Spatial Geometry ◽  
Preliminary Study

Dual energy X-ray absorptiometry (DXA) and quantitative computed tomography (QCT) are the two clinic imaging modalities available for examining bone quality. However, there is a dilemma in their selection. DXA uses a lower and safer X-ray dosage, but the produced image is two-dimensional, the information of bone spatial geometry and heterogeneous material distribution required for evaluating bone quality is missing; On the other hand, although QCT is able to capture all the required information, it has to use amuch higher X-ray dosage that may be a potentialhealth concern. Femur cross-section stiffness is an important parameter forassessing bone quality. Although itcan be determined from both DXA and QCT image, it is best computed from QCT for the reason mentioned in the above. In this study, we attempted to establish the ‘equivalence’ between DXA and QCT derived femur cross-section stiffness. If it is successful, DXA can be used in replacement of QCT in assessing bone quality. The study results showed that there indeed exist strong correlations between DXA and QCT derived femur stiffness, but they are not equivalent to each other.

scholarly journals Observation of Peripheral Retina by Topical Endoscopic Imaging Method—A Preliminary Study

2013 ◽  
Vol 2 (1) ◽  
pp. 11-18 ◽  
Author(s):  
Akira Hirata ◽  
Shinichiro Ishikawa ◽  
Satoshi Okinami
Keyword(s):  
Peripheral Retina ◽  
Imaging Method ◽  
Endoscopic Imaging ◽  
Preliminary Study

Identifying reflector azimuth from borehole multicomponent cross-dipole acoustic measurement

Geophysics ◽  
2021 ◽  
pp. 1-56
Author(s):  
Chao Li ◽  
Hao Chen ◽  
Xiao He ◽  
Xiuming Wang
Keyword(s):  
Dipole Source ◽  
Acoustic Measurement ◽  
Imaging Method ◽  
P Waves ◽  
Acoustic Reflection ◽  
Recorded Data ◽  
Reflection Imaging ◽  
The Cross ◽  
Receiver Arrays ◽  
Shear Horizontal

The borehole dipole shear-wave reflection imaging method has a high potential in heterogeneous reservoir explorations because of its deep investigation depth and relatively large reflection amplitude. However, the generally used shear horizontal (SH) reflection approach can only indicate the reflector strike and has an inherent defect in azimuth ambiguity. We have developed a multicomponent cross-dipole array acoustic measurement with four azimuthally distributed receiver arrays and a method using reflected dipole P-waves to eliminate the azimuth ambiguity caused by the SH reflection. The recorded data includes cross-dipole waves with four components and two combined dipole-monopole waves that stack the data of the four azimuthally distributed receivers induced by each dipole source. A theoretical analysis indicates that the dipole compressional reflection is sensitive to the reflector azimuth. Therefore, the cross-dipole waves are first used to determine the reflective interface strike with the SH reflection. The compressional reflections obtained from both the cross-dipole data and the combined dipole-monopole data are then processed to identify the correct azimuth. The effectiveness and accuracy of the method are validated via both synthetic and field data examples in a soft formation. The proposed method may potentially solve the azimuth ambiguity problem in borehole acoustic reflection imaging and fully use cross-dipole acoustic measurements.

The Ultrastructure of Metastatic Human Mammary Carcinoma After Prolonged Estrogen Therapy

1967 ◽  
Vol 25 ◽  
pp. 180-181
Author(s):  
John H.L. Watson ◽  
John L. Swedo ◽  
R.W. Talley
Keyword(s):  
Mammary Carcinoma ◽  
Osmium Tetroxide ◽  
Estrogen Therapy ◽  
Ultrastructural Level ◽  
Uranyl Acetate ◽  
Human Mammary Carcinoma ◽  
Surgical Biopsy ◽  
Lead Hydroxide ◽  
Preliminary Study ◽  
Hormonal Therapies

A preliminary study of human mammary carcinoma on the ultrastructural level is reported for a metastatic, subcutaneous nodule, obtained as a surgical biopsy. The patient's tumor had responded favorably to a series of hormonal therapies, including androgens, estrogens, progestins, and corticoids for recurring nodules over eight years. The pertinent nodule was removed from the region of the gluteal maximus, two weeks following stilbestrol therapy. It was about 1.5 cms in diameter, and was located within the dermis. Pieces from it were fixed immediately in cold fixatives: phosphate buffered osmium tetroxide, glutaraldehyde, and paraformaldehyde. Embedment in each case was in Vestopal W. Contrasting was done with combinations of uranyl acetate and lead hydroxide.

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