Laser Light Diffraction, Spatial Filtering, and Reconstruction of Medical Radiographic Images: A Pilot Study

1968 ◽  
Vol BME-15 (3) ◽  
pp. 186-195 ◽  
Author(s):  
Hal C. Becker ◽  
Phillip H. Meyers ◽  
Charles M. Nice
Keyword(s):  
Pilot Study ◽  
Laser Light ◽  
Spatial Filtering ◽  
Light Diffraction ◽  
Radiographic Images

Study of Cholesteric Textures in Phase Change Devices by Laser Light Diffraction

1981 ◽  
Vol 64 (9-10) ◽  
pp. 261-268 ◽  
Author(s):  
C M Waters ◽  
F C Saunders ◽  
M G Clark
Keyword(s):  
Phase Change ◽  
Laser Light ◽  
Light Diffraction

Modelling the activated sludge flocculation process combining laser light diffraction particle sizing and population balance modelling (PBM)

2002 ◽  
Vol 45 (6) ◽  
pp. 41-49 ◽  
Author(s):  
I. Nopens ◽  
C.A. Biggs ◽  
B. De Clercq ◽  
R. Govoreanu ◽  
B.-M. Wilén ◽  
...  
Keyword(s):  
Experimental Data ◽  
Laser Light ◽  
Population Balance ◽  
Light Diffraction ◽  
Balance Model ◽  
Floc Size ◽  
Shear Rates ◽  
Breakage Rate ◽  
On Line ◽  
Floc Size Distributions

A technique based on laser light diffraction is shown to be successful in collecting on-line experimental data. Time series of floc size distributions (FSD) under different shear rates (G) and calcium additions were collected. The steady state mass mean diameter decreased with increasing shear rate G and increased when calcium additions exceeded 8 mg/l. A so-called population balance model (PBM) was used to describe the experimental data. This kind of model describes both aggregation and breakage through birth and death terms. A discretised PBM was used since analytical solutions of the integro-partial differential equations are non-existing. Despite the complexity of the model, only 2 parameters need to be estimated: the aggregation rate and the breakage rate. The model seems, however, to lack flexibility. Also, the description of the floc size distribution (FSD) in time is not accurate.

scholarly journals Differences in Demographic and Radiographic Characteristics between Patients with Visible and Invisible T1 Slopes on Lateral Cervical Radiographic Images

2022 ◽  
Vol 11 (2) ◽  
pp. 411
Author(s):  
Sadayuki Ito ◽  
Hiroaki Nakashima ◽  
Akiyuki Matsumoto ◽  
Kei Ando ◽  
Masaaki Machino ◽  
...  
Keyword(s):  
Pilot Study ◽  
Surgical Planning ◽  
Vertical Axis ◽  
Sagittal Vertical Axis ◽  
Radiographic Images ◽  
T1 Slope ◽  
Group I ◽  
Significant Difference ◽  
The Mean ◽  
Flexion And Extension

Introduction: The T1 slope is important for cervical surgical planning, and it may be invisible on radiographic images. The prevalence of T1 invisible cases and the differences in demographic and radiographic characteristics between patients whose T1 slopes are visible or invisible remains unexplored. Methods: This pilot study aimed to evaluate the differences in these characteristics between outpatients whose T1 slopes were visible or invisible on radiographic images. Patients (n = 60) who underwent cervical radiography, whose T1 slope was confirmed clearly, were divided into the visible (V) group and invisible (I) group. The following radiographic parameters were measured: (1) C2-7 sagittal vertical axis (SVA), (2) C2-7 angle in neutral, flexion, and extension positions. Results: Based on the T1 slope visibility, 46.7% of patients were included in group I. The I group had significantly larger C2-7 SVA than the V group for males (p < 0.05). The C2-7 SVA tended to be larger in the I group, without significant difference for females (p = 0.362). Discussion: The mean C2-7 angle in neutral and flexion positions was not significantly different between the V and I groups for either sex. The mean C2-7 angle in the extension position was greater in the V group. The T1 slope was invisible in males with high C2-7 SVA.

Enhanced PDT effect in patients with esophageal cancer by laser light fractionation?A pilot study

1996 ◽  
Vol 43 (4) ◽  
pp. 341
Author(s):  
H. Messmann ◽  
R.M. Szeimies ◽  
V. Gross ◽  
W. Bumler ◽  
R. Knchel ◽  
...  
Keyword(s):  
Esophageal Cancer ◽  
Pilot Study ◽  
Laser Light

Optical Spatial Filtering of Radiographic Images with Binary Filters

Radiology ◽  
1974 ◽  
Vol 111 (2) ◽  
pp. 433-438 ◽  
Author(s):  
David J. Goodenough ◽  
Kunio Doi ◽  
Kurt Rossmann
Keyword(s):  
Spatial Filtering ◽  
Radiographic Images
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