Investigation on wall thickness ranges using digital radiography for tangential projection technique

2018 ◽  
Author(s):  
Wenwen Xu ◽  
jianping peng ◽  
lin luo ◽  
xiaorong gao ◽  
jinlong li ◽  
...  
Keyword(s):  
Digital Radiography ◽  
Wall Thickness ◽  
Projection Technique ◽  
Tangential Projection

Wall Thickness Measurement of Pipes Using Digital Radiography and Three Wavelet Methods

2020 ◽  
Vol 39 (1) ◽  
Author(s):  
Zeinab Kiapasha ◽  
Effat Yahaghi ◽  
Mahdi Mirzapour ◽  
Sajjad Monem ◽  
Jahangir Nekoei
Keyword(s):  
Digital Radiography ◽  
Wall Thickness ◽  
Thickness Measurement ◽  
Wall Thickness Measurement ◽  
Wavelet Methods

scholarly journals PEDS: SOFTWARE TO ASSESS WALL THICKNESS LOSS AND WELD THICKNESS LOSS IN OFFSHORE PIPELINES THROUGH DIGITAL RADIOGRAPHY

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
EDMILSON MONTEIRO SOUZA ◽  
A.L.S. Germano ◽  
D.F. Oliveira ◽  
S.C.A. Corrêa ◽  
A.X. Silva ◽  
...  
Keyword(s):  
Digital Radiography ◽  
Wall Thickness ◽  
Offshore Pipelines ◽  
Thickness Loss

Assessment of Myocardial Viability in Persistent Defects on Thallium-201 SPECT after Reinjection Using Gradient-Echo MRI

1996 ◽  
Vol 35 (05) ◽  
pp. 146-152 ◽  
Author(s):  
A. Kögler ◽  
H.-A. Schmitt ◽  
D. Emrich ◽  
H. Kreuzer ◽  
D. L. Munz ◽  
...  
Keyword(s):  
Wall Thickness ◽  
Myocardial Viability ◽  
Cardiac Cycle ◽  
Single Photon ◽  
Contractile Function ◽  
Left Ventricular ◽  
Wall Thickening ◽  
Gradient Echo ◽  
Systolic Wall Thickening

SummaryThis prospective study assessed myocardial viability in 30 patients with coronary heart disease and persistent defects despite reinjection on TI-201 single-photon computed tomography (SPECT). In each patient, three observers graded TI-201 uptake in 7 left ventricular wall segments. Gradient-echo magnetic resonance imaging in the region of the persistent defect generated 12 to 16 short axis views representing a cardiac cycle. A total of 120 segments were analyzed. Mean end-diastolic wall thickness and systolic wall thickening (± SD) was 11.5 ± 2.7 mm and 5.8 ± 3.9 mm in 48 segments with normal TI-201 uptake, 10.1 ± 3.4 mm and 3.7 ± 3.1 mm in 31 with reversible lesions, 11.3 ± 2.8 mm and 3.3 ± 1.9 mm in 10 with mild persistent defects, 9.2 ± 2.9 mm and 3.2 ±2.2 mm in 15 with moderate persistent defects, 5.8 ± 1.7 mm and 1.3 ± 1.4 mm in 16 with severe persistent defects, respectively. Significant differences in mean end-diastolic wall thickness (p <0.0005) and systolic wall thickening (p <0.005) were found only between segments with severe persistent defects and all other groups, but not among the other groups. On follow-up in 11 patients after revascularization, 6 segments with mild-to-moderate persistent defects showed improvement in mean systolic wall thickening that was not seen in 6 other segments with severe persistent defects. These data indicate that most myocardial segments with mild and moderate persistent TI-201 defects after reinjection still contain viable tissue. Segments with severe persistent defects, however, represent predominantly nonviable myocardium without contractile function.

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