Genauigkeit der Computer-assistierten Volumetrie von Lungenrundherden. Vergleich der Messungen anhand von Datensätzen unterschiedlicher CT Scanner (Einzelschicht bis Mehrschicht-Spiral CT)

2006 ◽  
Vol 178 (S 1) ◽  
Author(s):  
M Das ◽  
G Mühlenbruch ◽  
AH Mahnken ◽  
C Hohl ◽  
D Honnef ◽  
...  
Keyword(s):  
Spiral Ct ◽  
Ct Scanner

Skeletal SPECT/CT of the peripheral extremities -interdisciplinary approach in orthopaedic disorders-first clinical results

Open Medicine ◽  
2007 ◽  
Vol 2 (4) ◽  
pp. 499-510 ◽  
Author(s):  
Wolfgang Wuest ◽  
Torsten Kuwert ◽  
Markus Grunewald ◽  
Werner Bautz ◽  
Raimund Forst ◽  
...  
Keyword(s):  
Diagnostic Accuracy ◽  
Hybrid Imaging ◽  
Single Photon ◽  
Photon Emission ◽  
Interdisciplinary Approach ◽  
Spiral Ct ◽  
Emission Computed Tomography ◽  
Main Diagnosis ◽  
Ct Scanner ◽  
Lesion Localization

AbstractBone scintigraphy, although quite sensitive to detect skeletal lesions, has a comparatively low specificity. Hybrid-cameras combining single-photon emission computed tomography (SPECT) and spiral-CT offer the opportunity to correlate scintigraphic information with high-quality visualization of morphology in one session. This may lead to an improvement in diagnostic accuracy and anatomic lesion localization. We present 11 patients, who underwent SPECT/CT of the feet (n=10) and hands (n = 1). The examinations were performed due to pain in foot or hand with the following suspected clinical diagnoses: arthrosis (n=1); fracture (n=3); osteomyelitis (n=4); reflex dystrophia (n=1); and, pain of unclear origin (n=2). All patients underwent SPECT/CT hybrid imaging using a dual-headed SPECT camera integrated with a 2-slice spiral CT scanner in one gantry. SPECT, CT, and SPECT/CT were evaluated independently from each other with respect to main diagnosis, anatomic lesion localization, and detection of a possible additional diagnosis. SPECT/CT improved lesion localization in 8 of 11 patients (73%) in comparison to SPECT alone, and in 4 of 11 patients (36%) in comparison to CT alone. Diagnostic accuracy was improved in 4 of 11 patients (36%) in comparison to either SPECT or CT alone. In conclusion, skeletal SPECT/CT improves diagnostic accuracy and lesion localization of orthopedic disorders in the feet and hands. The obtained results encouraged extensive studies to further investigate the potential gain in diagnostic accuracy brought about by SPECT/spiral-CT hybrid imaging in orthopedic disorders of the peripheral extremities.

Experimental Determination of Computed Tomography Settings for Jaw Scanning

1970 ◽  
Vol 111 (5) ◽  
pp. 129-132
Author(s):  
R. Adaskevicius ◽  
D. Macianskytė ◽  
E. Monastyreckiene
Keyword(s):  
Computed Tomography ◽  
Laser Scanner ◽  
Spiral Ct ◽  
Computer Models ◽  
Ct Scanner ◽  
Experimental Identification ◽  
Ct Data ◽  
3D Computer Model ◽  
Design And Manufacture

Aim of our study is to develop a method for the experimental identification of the settings of a computed tomography (CT) scanner used for scanning of human jaw. I this case, CT can be used for rapid prototyping of human jaw, design and manufacture of implants. The experimental identification of settings of a computed tomography scanner is done by comparing 3D computer models built using different data acquisition technologies: CT scanner and 3D laser scanner. The modified Iterative Closest Points algorithm is used for alignment of 3D computer models, obtained using different scanning methods. The different test objects were scanned using a spiral CT scanner and 3D laser scanner for testing the method. 3D computer models were compared uding the mean square value of distance between two surfaces. The test results indicate hardware and software parameters impacting on the accuracy and surface quality of 3D computer model reconstructed from CT data. Ill. 5, bibl. 7 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.111.5.373

SPECT/CT imaging using a spiral CT scanner for anatomical localization: Impact on diagnostic accuracy and reporter confidence in clinical practice

2006 ◽  
Vol 27 (12) ◽  
pp. 977-987 ◽  
Author(s):  
Paul J. Roach ◽  
Geoffrey P. Schembri ◽  
Ivan A. Ho Shon ◽  
Elizabeth A. Bailey ◽  
Dale L. Bailey
Keyword(s):  
Clinical Practice ◽  
Diagnostic Accuracy ◽  
Spiral Ct ◽  
Ct Imaging ◽  
Ct Scanner ◽  
Anatomical Localization

scholarly journals Quantitative analysis of concrete on the basis of fuzzy set and computerised tomography number

2020 ◽  
Vol 24 (6 Part B) ◽  
pp. 3907-3913
Author(s):  
Jian-Yin Fang ◽  
Na Li ◽  
Fei Qu ◽  
Zhan-Shuang Dou ◽  
Shu-Tian Li
Keyword(s):  
Uniaxial Compression ◽  
Ct Scanning ◽  
Spiral Ct ◽  
Hardened Cement ◽  
Ct Scanner ◽  
Ct Number ◽  
Portable Power ◽  
Power Loading ◽  
Aggregate Rate ◽  
Ct Test

In this study, the portable power loading device and medical Marconi M8000 spiral CT scanner are used to conduct the uniaxial compression CT scanning test of the concrete. The concrete porosity, hardened cement rate, and aggregate rate are defined, and the variation law of the concrete is analyzed in the uniaxial compression CT test. The proposed method is considered to utilize the value of each CT number, to realize the quantitative partition of the various components of concrete, and to quantitatively evaluate the damage evolution law of the concrete and strain localization during stress. It is shown that damage at the middle section increased from inside to the outside in the uniaxial compression CT test of the concrete.

Impact of the z-flying focal spot on resolution and artifact behavior for a 64-slice spiral CT scanner

2006 ◽  
Vol 16 (6) ◽  
pp. 1206-1215 ◽  
Author(s):  
Yiannis Kyriakou ◽  
Marc Kachelrieβ ◽  
Michael Knaup ◽  
Jens U. Krause ◽  
Willi A. Kalender
Keyword(s):  
Focal Spot ◽  
Spiral Ct ◽  
Ct Scanner

scholarly journals CT head findings in suspected cases of head injury

2017 ◽  
Vol 8 (2) ◽  
pp. 76-81
Author(s):  
Surendra Maharjan ◽  
Saroj Chhetry ◽  
Neyaj Ahmed ◽  
Pasang Sherpa
Keyword(s):  
Head Injury ◽  
Ct Scan ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Spiral Ct ◽  
Physical Assault ◽  
Positive Finding ◽  
Ct Scanner ◽  
Altered Level ◽  
Female Head

Background: Head injury is one of the leading causes of morbidity and mortality throughout the world. Fall injury is the main cause of head trauma followed by road traffic accidents (RTA) and physical assault. Every victim with altered level of consciousness must be evaluated for brain injury. Radiological evaluation has undergone dramatic changes with the advent of computed tomography (CT) as it can precisely define the nature and location of the culprit lesion(s).Aims and Objective: To identify the major CT scan findings in suspected cases of Head injury.Materials and Methods: Three hundred seventeen patients of age 4 years and above, with suspected cases of head injury attending emergency department of TUTH during a period of 3 months (28 June 2012 to 28 September 2012) were included in this study. Non-contrast CT scan of head was performed in a single slice Hitachi Spiral CT scanner and 10 mm axial slices of head without any interslice gap were obtained at 15-20 degrees to the canthomeatal line. Data analysis was performed in SPSS v.21.0 software.Results: From 317 patients studied 198(62.5%) were male and 119 (37.5%) were female. Head injury was more common in male. 80(25.23%) were below 15 years of age, 221(69.73%) were between 16 to 65 years and only 16(5.04%) were above 66 years of age. The mean age was 28.57 years. In 239(75.4%) of patients the CT scan was normal. The most common cause of head injury was fall which was found in 210(66.2%) patients followed by RTA 82(25.9%) and Physical Assault 25(7.9%). Fall as a cause of head injury was more common in children and old people, with the RTA being more common in adults and adolescents. The most common positive finding in CT was contusion which was found in 32(10.1%), 25(7.9%) had SDH, 11(3.5%) of the patients had EDH, 10(3.2%) had SAH. Headache was found to be nonspecific for predicting positive CT findings.Conclusion: CT was found highly sensitive in demonstrating fractures and was considered the modality of choice when imaging suspected cases of head injury and in emergency patients due to its accuracy, reliability, safety and wide availability.Asian Journal of Medical Sciences Vol.8(2) 2017 76-81

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