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Automatic segmentation and recognition of lungs and lesion from CT scans of thorax.

https://arctichealth.org/en/permalink/ahliterature90938
Source
Comput Med Imaging Graph. 2009 Jan;33(1):72-82
Publication Type
Article
Date
Jan-2009
Author
Kakar Manish
Olsen Dag Rune
Author Affiliation
Department of Radiation Biology, Institute for Cancer Research, Rikshospitalet-Radiumhospitalet Medical centre, Oslo, Norway. Manish.Kakar@rr-research.no
Source
Comput Med Imaging Graph. 2009 Jan;33(1):72-82
Date
Jan-2009
Language
English
Publication Type
Article
Keywords
Anatomy, Cross-Sectional - methods
Cluster analysis
Fuzzy Logic
Humans
Image Processing, Computer-Assisted - methods
Imaging, Three-Dimensional - methods
Lung - pathology - radiography
Lung Neoplasms - pathology - radiography
Models, Statistical
Neural Networks (Computer)
Norway
Pattern Recognition, Automated - methods
Radiography, Thoracic - methods
Sensitivity and specificity
Thorax - pathology
Tomography, X-Ray Computed - methods
Abstract
In this study, a fully automated texture-based segmentation and recognition system for lesion and lungs from CT of thorax is presented. For the segmentation part, we have extracted texture features by Gabor filtering the images, and, then combined these features to segment the target volume by using Fuzzy C Means (FCM) clustering. Since clustering is sensitive to initialization of cluster prototypes, optimal initialization of the cluster prototypes was done by using a Genetic Algorithm. For the recognition stage, we have used cortex like mechanism for extracting statistical features in addition to shape-based features. The segmented regions showed a high degree of imbalance between positive and negative samples, so we employed over and under sampling for balancing the data. Finally, the balanced and normalized data was subjected to Support Vector Machine (SimpleSVM) for training and testing. Results reveal an accuracy of delineation to be 94.06%, 94.32% and 89.04% for left lung, right lung and lesion, respectively. Average sensitivity of the SVM classifier was seen to be 89.48%.
PubMed ID
19059759 View in PubMed
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A comparison of ultrasound measurements to assess carotid atherosclerosis development in subjects with and without type 2 diabetes.

https://arctichealth.org/en/permalink/ahliterature174306
Source
Cardiovasc Ultrasound. 2005;3:15
Publication Type
Article
Date
2005
Author
Rebecca L Pollex
J David Spence
Andrew A House
Aaron Fenster
Anthony J G Hanley
Bernard Zinman
Stewart B Harris
Robert A Hegele
Author Affiliation
Robarts Research Institute, London, Ontario, Canada. rpollex@robarts.ca
Source
Cardiovasc Ultrasound. 2005;3:15
Date
2005
Language
English
Publication Type
Article
Keywords
Adult
Aged
Anatomy, Cross-Sectional
Canada - epidemiology
Carotid Artery Diseases - epidemiology - ultrasonography
Diabetes Mellitus, Type 2 - epidemiology - ultrasonography
Echocardiography - methods - statistics & numerical data
Female
Humans
Image Interpretation, Computer-Assisted - methods
Imaging, Three-Dimensional - methods
Incidence
Male
Middle Aged
Prognosis
Reproducibility of Results
Risk Assessment - methods
Risk factors
Sensitivity and specificity
Single-Blind Method
Abstract
Subjects with type 2 diabetes are at an increased risk of vascular complications. The use of carotid ultrasound remains an attractive, non-invasive method to monitor atherosclerotic disease progression and/or response to treatment in patients with type 2 diabetes, with intima-media thickness routinely used as the gold standard to detect pathology. However, alternative measurements, such as plaque area or volume, may represent a potentially more powerful approach. Thus, the objective of this study was to compare the traditional intima-media thickness measurement against the novel total plaque volume measurement in analyzing carotid atherosclerosis development in individuals with type 2 diabetes.
The case-control study included 49 Oji-Cree adults with diabetes or impaired glucose tolerance, aged 21-69, and 49 sex- and age-matched normoglycemic subjects. At baseline, metabolic variables were measured, including body mass index, waist circumference, total cholesterol: high density lipoprotein ratio, plasma triglycerides, plasma glucose, and serum insulin. Carotid ultrasound measurements, 7 years later, assessed carotid arterial intima-media thickness and total plaque volume.
At baseline, the two groups were well matched for smoking habits, hypertension, body mass index, and waist circumference. Differences were noted in baseline measurements of total cholesterol:high density lipoprotein (P = 0.0006), plasma triglycerides (P 0.70 when comparing intima-media thickness measurements for diabetics versus non-diabetics, thousands of study subjects are required. For comparing total plaque volume measurements, only hundreds of study subjects are required.
The development of atherosclerotic plaque is greater in subjects with diabetes/impaired glucose tolerance. Total plaque volume appears to capture the atherosclerotic disease burden more effectively in subjects with type 2 diabetes, and would be an appropriate outcome measure for studies aimed at changing the diabetic milieu.
Notes
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Cites: Arterioscler Thromb Vasc Biol. 2003 Jun 1;23(6):1035-4112702517
Cites: Hypertens Res. 2003 Jun;26(6):465-7112862203
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Cites: Stroke. 2005 Sep;36(9):1904-916081857
Cites: Curr Drug Targets Cardiovasc Haematol Disord. 2004 Jun;4(2):161-7515180488
Cites: Atherosclerosis. 1994 Nov;111(1):1-117840805
Cites: Diabetes. 1995 Apr;44(4):369-747698502
Cites: Diabetes Care. 1998 Nov;21(11):1812-89802726
Cites: Atherosclerosis. 2005 Feb;178(2):319-2515694940
Cites: Stroke. 2004 Apr;35(4):864-915017019
PubMed ID
15958169 View in PubMed
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Cross-sectional area of the paraspinal muscles and its association with muscle strength among fighter pilots: a 5-year follow-up.

https://arctichealth.org/en/permalink/ahliterature302603
Source
BMC Musculoskelet Disord. 2019 Apr 16; 20(1):170
Publication Type
Journal Article
Date
Apr-16-2019
Author
Tuomas Honkanen
Matti Mäntysaari
Tuomo Leino
Janne Avela
Liisa Kerttula
Ville Haapamäki
Heikki Kyröläinen
Author Affiliation
Centre for Military Medicine, P.O.Box 50, FI-00301, Helsinki, Finland. tuomas.honkanen@mil.fi.
Source
BMC Musculoskelet Disord. 2019 Apr 16; 20(1):170
Date
Apr-16-2019
Language
English
Publication Type
Journal Article
Keywords
Adult
Anatomy, Cross-Sectional
Finland - epidemiology
Follow-Up Studies
Humans
Incidence
Longitudinal Studies
Low Back Pain - epidemiology - physiopathology
Lumbar Vertebrae
Magnetic Resonance Imaging
Male
Muscle Strength - physiology
Occupational Diseases - epidemiology - physiopathology
Paraspinal Muscles - anatomy & histology - physiology
Pilots
Young Adult
Abstract
A small cross sectional area (CSA) of the paraspinal muscles may be related to low back pain among military aviators but previous studies have mainly concentrated on spinal disc degeneration. Therefore, the primary aim of the study was to investigate the changes in muscle CSA and composition of the psoas and paraspinal muscles during a 5-year follow up among Finnish Air Force (FINAF) fighter pilots.
Study population consisted of 26 volunteered FINAF male fighter pilots (age: 20.6 (±0.6) at the baseline). The magnetic resonance imaging (MRI) examinations were collected at baseline and after 5?years of follow-up. CSA and composition of the paraspinal and psoas muscles were obtained at the levels of 3-4 and 4-5 lumbar spine. Maximal isometric strength tests were only performed on one occasion at baseline.
The follow-up comparisons indicated that the mean CSA of the paraspinal muscles increased (p 
PubMed ID
30991977 View in PubMed
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Morphological characteristics of skeletal muscles in relation to gender.

https://arctichealth.org/en/permalink/ahliterature52090
Source
Aging Clin Exp Res. 2003 Jun;15(3):264-9
Publication Type
Article
Date
Jun-2003
Author
Jennifer Fox
Peter Garber
Monica Hoffman
David Johnson
Paul Schaefer
Julie Vien
Christine Zeaton
Ladora V Thompson
Author Affiliation
Department of Physical Medicine and Rehabilitation, University of Minnesota, Minneapolis 55455, USA.
Source
Aging Clin Exp Res. 2003 Jun;15(3):264-9
Date
Jun-2003
Language
English
Publication Type
Article
Keywords
Aging - physiology
Anatomy, Cross-Sectional
Animals
Female
Male
Muscle Fibers - ultrastructure
Muscle, Skeletal - anatomy & histology
Rats
Rats, Inbred Strains
Sex Characteristics
Abstract
BACKGROUND AND AIMS: The aim of this study was to ascertain whether there are gender-related differences in the morphological characteristics of the soleus and tibialis anterior muscles in young adult and old Fischer 344/Brown Norway F1 rats. METHODS: We tested 1) whether there was a gender-related difference between the fiber type composition of these muscles, and 2) whether the cross-sectional area of individual muscle fibers demonstrated gender-associated differences, fibers from males being larger than fibers from females. RESULTS: Gender differences were not found in the fiber type composition of the soleus and tibialis anterior muscles, but were present in the single skeletal fiber cross-sectional area of the tibialis anterior muscle. The cross-sectional area of type I fibers in females was greater than that in males at both 12 (16%) and 30 (5%) months of age. In contrast, the cross-sectional area of type Ila fibers of 12-month-old males was larger than that of 12-month-old females. No significant differences between genders were found for the cross-sectional area of type Ilb fibers in either age group. In the soleus muscle, 30-month-old males had larger single fiber cross-sectional areas of both fiber types I and lIa. At 12 months of age, type I fibers from females were larger than those from males. CONCLUSIONS: Our findings indicate that gender-related differences exist in the size of individual skeletal fibers from the soleus and tibialis anterior muscles and that they may influence metabolism and the adaptive response to rehabilitation programs.
PubMed ID
14582690 View in PubMed
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Neonatal respiratory distress caused by cryptic dacryoceles.

https://arctichealth.org/en/permalink/ahliterature4044
Source
Alaska Med. 1996 Jul-Sep;38(3):86-8
Publication Type
Article
Author
R W Arnold
J. List
C E Rosen
E H Johnson
R O Hoffman
Author Affiliation
Orbit, Plastic and Neuroophthalmology Ophthalmic Associates, Anchorage, Alaska 99501-2242, USA.
Source
Alaska Med. 1996 Jul-Sep;38(3):86-8
Language
English
Publication Type
Article
Keywords
Anatomy, Cross-Sectional
Female
Humans
Infant, Newborn
Lacrimal Apparatus Diseases - congenital - therapy
Mucocele - congenital - therapy
Nasolacrimal Duct - abnormalities - pathology
Respiratory Distress Syndrome, Newborn - etiology - therapy
Tomography, X-Ray Computed
Abstract
Two cases of neonatal respiratory distress responded with treatment of bilateral dacryocele. In one case, no visible or palpable external evidence of dacryocele was present until mucopurulent discharge commenced more than a week after birth. While the incidence of typical congenital nasolacrimal duct obstruction is about 6%, dacryocele is 200 times less common.
PubMed ID
8936696 View in PubMed
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Relationship between calf muscle size and strength after achilles rupture repair.

https://arctichealth.org/en/permalink/ahliterature49938
Source
Foot Ankle Int. 2000 Apr;21(4):330-5
Publication Type
Article
Date
Apr-2000
Author
J. Leppilahti
S. Lähde
K. Forsman
J. Kangas
K. Kauranen
S. Orava
Author Affiliation
Department of Surgery, Oulu University Hospital, Finland.
Source
Foot Ankle Int. 2000 Apr;21(4):330-5
Date
Apr-2000
Language
English
Publication Type
Article
Keywords
Achilles Tendon - injuries - surgery
Adult
Anatomy, Cross-Sectional
Athletic Injuries - pathology - physiopathology - surgery
Chi-Square Distribution
Exercise Therapy
Female
Follow-Up Studies
Foot - physiopathology
Humans
Immobilization
Isometric Contraction - physiology
Leg - pathology - physiopathology
Male
Middle Aged
Muscle Contraction - physiology
Muscle, Skeletal - pathology - physiopathology
Rupture
Tomography, X-Ray Computed
Torque
Weight-Bearing
Abstract
The object was to study the relationships between calf muscle size and strength in 85 patients an average of 3.1 years after repair of achilles tendon rupture. The isokinetic calf muscle strength results were excellent or good for 73% of the patients, whereas calf muscle size was normal in only 30%. The average plantar flexion peak torque per unit muscle cross-sectional area was higher on the injured side than on the uninjured side. The average calf muscle cross-sectional area deficit was 15+/-9% (p
PubMed ID
10808974 View in PubMed
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Tibial bone density, cross-sectional geometry and strength in Finnish pet rabbits: a peripheral quantitative computed tomography study.

https://arctichealth.org/en/permalink/ahliterature295842
Source
Vet Rec. 2018 Sep 29; 183(12):382
Publication Type
Journal Article
Date
Sep-29-2018
Author
Johanna Mäkitaipale
Harri Sievänen
Outi Laitinen-Vapaavuori
Author Affiliation
Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland.
Source
Vet Rec. 2018 Sep 29; 183(12):382
Date
Sep-29-2018
Language
English
Publication Type
Journal Article
Keywords
Anatomy, Cross-Sectional
Animals
Bone Density
Female
Finland
Male
Pets
Rabbits
Tibia - anatomy & histology - physiology
Tomography, X-Ray Computed - veterinary
Abstract
Rabbit bones are brittle and prone to fissure formation. Radiographs of very young and old rabbits are often indicative of decreased bone density. The aim of this study was to investigate the tibial bone parameters in pet rabbits, and their association with age, sex, castration and dental disease. Eighty-seven (43 female/5 spayed, 44 male/19 castrated) pet rabbits (mean age 2.6 years, range 0.3-9.3 years) of various breeds were studied, of which 37 had dental disease. Right tibiae were scanned with peripheral quantitative CT at the distal (4percent) and mid-shaft sites (50percent of the tibial length). Analysed bone parameters included the total cross-sectional area, cortical bone area and density, trabecular bone density and strength-strain index. The mean diaphyseal cortical density was high (about 1400?mg/cm3) in comparison to many other species. Within the studied age range, age was weakly but positively associated with diaphyseal cortical density, with the juvenile rabbits clearly showing the lowest values. There was no tendency for age-related decrease in trabecular or cortical bone density at least up to six years of age. Neither were sex, castration nor dental disease associated with decreased tibial bone density.
PubMed ID
29960983 View in PubMed
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[XVII International Conference on Plastination (July, 14-18, 2014, St. Petersburg)].

https://arctichealth.org/en/permalink/ahliterature265711
Source
Morfologiia. 2015;147(2):100-1
Publication Type
Article
Date
2015

8 records – page 1 of 1.