scholarly journals A Combined Noise Reduction and Partial Volume Estimation Method for Image Quantitation

2006 ◽  
Author(s):  
John Chiverton ◽  
Kevin Wells ◽  
Mike Partridge
Keyword(s):  
Noise Reduction ◽  
Estimation Method ◽  
Volume Estimation ◽  
Partial Volume ◽  
Image Quantitation

Segmentation-Based Partial Volume Correction for Volume Estimation of Solid Lesions in CT

2014 ◽  
Vol 33 (2) ◽  
pp. 462-480 ◽  
Author(s):  
Frank Heckel ◽  
Hans Meine ◽  
Jan H. Moltz ◽  
Jan-Martin Kuhnigk ◽  
Johannes T. Heverhagen ◽  
...  
Keyword(s):  
Volume Estimation ◽  
Partial Volume Correction ◽  
Partial Volume ◽  
Volume Correction ◽  
Solid Lesions

A Novel Clustering Method for Quick Partial Volume Estimation in MR Brain Images

2008 ◽  
Vol 41 (2) ◽  
pp. 9619-9624
Author(s):  
László Szilágyi ◽  
Sándor M. Szilágyi ◽  
Balázs Benyó ◽  
Zoltán Benyó
Keyword(s):  
Volume Estimation ◽  
Clustering Method ◽  
Brain Images ◽  
Partial Volume ◽  
Mr Brain Images ◽  
Mr Brain

Computed Tomographic Estimation of Particulate Cancellous Bone and Marrow Weight for Successful Transplant in Unilateral Cleft Lip and Palate Patients

2017 ◽  
Vol 54 (3) ◽  
pp. 327-333 ◽  
Author(s):  
Hiroshi Watanabe ◽  
Kenichi Kurita ◽  
Atsushi Nakayama ◽  
Eri Umemura ◽  
Masaki Ogita ◽  
...  
Keyword(s):  
Cancellous Bone ◽  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Estimation Method ◽  
Volume Estimation ◽  
Treatment Results ◽  
Computed Tomographic ◽  
Preoperative Ct ◽  
Level 3 ◽  
Defect Volume

Objective The defect volume measured on computed tomography (CT) for secondary bone graft (SBG) is well correlated to the actual amount of particulate cancellous bone and marrow (PCBM) transplanted in unilateral cleft lip and palate (UCLP) patients. However, the validity of such measurements have not been completely verified due to lack of evaluation of treatment results. The objective of this study was to propose an estimation method by CT based on the data of successfully treated patients. For this purpose, the association was initially verified between the weight of transplanted PCBM and the defect volume measured on CT using the results of successfully treated patients. Methods Treatment results were evaluated 1 year after SBG by intraoral radiography in 50 UCLP patients. For the patients with good results, the correlation was investigated between the defect volume on CT and the transplanted PCBM weight, and a method was proposed based on PCBM density, calculated as PCBM weight divided by defect volume on CT. Results In successfully treated patients showing level 3 or 4 alveolar resorption, a strong correlation ( r = .87) was found between the volume on CT and the PCBM weight. Level 4 results were observed in 22 of 23 (95.7%) patients who had calculated PCBM densities of more than 6 g/cm3. Conclusions Volume estimation on preoperative CT was confirmed to have sufficient validity. The weight of PCBM transplanted should be greater than the defect volume on CT multiplied by 6.

scholarly journals Estimating the volume of glaciers in the Himalayan–Karakoram region using different methods

2014 ◽  
Vol 8 (6) ◽  
pp. 2313-2333 ◽  
Author(s):  
H. Frey ◽  
H. Machguth ◽  
M. Huss ◽  
C. Huggel ◽  
S. Bajracharya ◽  
...  
Keyword(s):  
Thickness Distribution ◽  
Critical Evaluation ◽  
Estimation Method ◽  
Volume Estimation ◽  
Ice Thickness ◽  
Model Parameters ◽  
Distribution Models ◽  
Ice Volume ◽  
Sensitivity Assessment ◽  
Volume Estimates

Abstract. Ice volume estimates are crucial for assessing water reserves stored in glaciers. Due to its large glacier coverage, such estimates are of particular interest for the Himalayan–Karakoram (HK) region. In this study, different existing methodologies are used to estimate the ice reserves: three area–volume relations, one slope-dependent volume estimation method, and two ice-thickness distribution models are applied to a recent, detailed, and complete glacier inventory of the HK region, spanning over the period 2000–2010 and revealing an ice coverage of 40 775 km2. An uncertainty and sensitivity assessment is performed to investigate the influence of the observed glacier area and important model parameters on the resulting total ice volume. Results of the two ice-thickness distribution models are validated with local ice-thickness measurements at six glaciers. The resulting ice volumes for the entire HK region range from 2955 to 4737 km3, depending on the approach. This range is lower than most previous estimates. Results from the ice thickness distribution models and the slope-dependent thickness estimations agree well with measured local ice thicknesses. However, total volume estimates from area-related relations are larger than those from other approaches. The study provides evidence on the significant effect of the selected method on results and underlines the importance of a careful and critical evaluation.

An Improved Noise Reduction Algorithm Based on Manifold Learning and Its Application to Signal Noise Reduction

2010 ◽  
Vol 26-28 ◽  
pp. 653-656 ◽  
Author(s):  
Guang Bin Wang ◽  
Liang Pei Huang
Keyword(s):  
Noise Reduction ◽  
Manifold Learning ◽  
Estimation Method ◽  
Vibration Signal ◽  
Reduction Algorithm ◽  
Intrinsic Dimension ◽  
Reduction Effect ◽  
Dimension Space ◽  
Space Data ◽  
Noise Reduction Algorithm

In the noise reduction algorithm based on manifold learning, phase space data may be distorted and reduction targets are chosen at random, it made efficiency and effect of noise reduction lower.To solve this problem, a improved noise reducation method (local tangent space mean reconstruction) was proposed.The process of global array by affine transformation will be replaced with mean reconstruction,and the intrinsic dimension was estimate as dimension of reduction targets by using maximum likehood estimation method, the data in addition to intrinsic dimension space will be eliminated.Noise reduction experiment to fan vibration signal with noise shows this method had better noise reduction effect.

scholarly journals Glacier Volume Estimation on Cascade Volcanoes: An Analysis and Comparison with Other Methods

1986 ◽  
Vol 8 ◽  
pp. 59-64 ◽  
Author(s):  
C.L. Driedger ◽  
P.M. Kennard
Keyword(s):  
Estimation Method ◽  
Cascade Range ◽  
Volume Estimation ◽  
Aerial Photographs ◽  
Topographic Maps ◽  
Estimation Methods ◽  
Ice Thickness ◽  
Mount Rainier ◽  
Three Sisters ◽  
Mount St Helens

During the 1980 eruption of Mount St. Helens, the occurrence of floods and mudflows made apparent a need to assess mudflow hazards on other Cascade volcanoes. A basic requirement for such analysis is information about the volume and distribution of snow and ice on these volcanoes.An analysis was made of the volume-estimation methods developed by previous authors and a volume- estimation method was developed for use in the Cascade Range. A radio echo-sounder, carried in a backpack, was used to make point measurements of ice thickness on major glaciers of four Cascade volcanoes (Mount Rainier, Washington; Mount Hood and the Three Sisters, Oregon; and Mount Shasta, California), These data were used to generate ice-thickness maps and bedrock topographic maps for developing and testing volume-estimation methods. Subsequently, the methods were applied to the unmeasured glaciers on those mountains and, as a test of the geographical extent of applicability, to glaciers beyond the Cascades having measured volumes.Two empirical relationships were required in order to predict volumes for all the glaciers. Generally, for glaciers less than 2.6 km in length, volume was found to be estimated best by using glacier area, raised to a power. For longer glaciers, volume was found to be estimated best by using a power law relationship, including slope and shear stress. The necessary variables can be estimated from topographic maps and aerial photographs.

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