scholarly journals Intelligent 4D CT sequence scanning (i4DCT): First scanner prototype implementation and phantom measurements of automated breathing signal‐guided 4D CT

2020 ◽  
Vol 47 (6) ◽  
pp. 2408-2412 ◽  
Author(s):  
René Werner ◽  
Thilo Sentker ◽  
Frederic Madesta ◽  
Annette Schwarz ◽  
Marc Vornehm ◽  
...  
Keyword(s):  
Prototype Implementation ◽  
4D Ct ◽  
Phantom Measurements

Bewegungsadaptierte Schwächungskorrektur mit Averaging-CT und 4D-CT im 4D PET-CT der Lunge

2012 ◽  
Vol 184 (12) ◽  
Author(s):  
M Baier ◽  
M Ullrich ◽  
J Dinkel ◽  
F Schoenahl ◽  
U Lützen ◽  
...  
Keyword(s):  
4D Ct ◽  
Pet Ct

4D-CT bei atemgetriggerten Bestrahlungen

2008 ◽  
Vol 180 (S 1) ◽  
Author(s):  
K Mathias ◽  
A Block ◽  
O Waletzko ◽  
C Vockelmann ◽  
R Rohn
Keyword(s):  
4D Ct

4D Computed Tomography for Dynamic Upper Airway Evaluation in Robin Sequence

2021 ◽  
pp. 019459982110021
Author(s):  
Austin S. Lam ◽  
Michael D. Bindschadler ◽  
Kelly N. Evans ◽  
Seth D. Friedman ◽  
Jeffrey P. Otjen ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Upper Airway ◽  
Quantitative Information ◽  
4D Ct ◽  
Robin Sequence ◽  
Analysis Tools ◽  
Airway Caliber ◽  
4D Computed Tomography ◽  
Ct Data ◽  
Sample Case

Thorough assessment of dynamic upper airway obstruction (UAO) in Robin sequence (RS) is critical, but traditional evaluation modalities have significant limitations. Four-dimensional computed tomography (4D-CT) is promising in that it enables objective and quantitative evaluation throughout all phases of respiration. However, there exist few protocols or analysis tools to assist in obtaining and interpreting the vast amounts of obtained data. A protocol and set of data analysis tools were developed to enable quantification and visualization of dynamic 4D-CT data. This methodology was applied to a sample case at 2 time points. In the patient with RS, overall increases in normalized airway caliber were observed from 5 weeks to 1 year. There was, however, continued dynamic obstruction at all airway levels, though objective measures of UAO did improve at the nasopharynx and oropharynx. Use of 4D-CT and novel analyses provide additional quantitative information to evaluate UAO in patients with RS.

scholarly journals Secure Remote Storage of Logs with Search Capabilities

2021 ◽  
Vol 1 (2) ◽  
pp. 340-364
Author(s):  
Rui Araújo ◽  
António Pinto
Keyword(s):  
Search Algorithm ◽  
Prototype Implementation ◽  
Standard Practice ◽  
Plain Text ◽  
Server Side ◽  
Remote Storage ◽  
Text Information ◽  
Nested Queries ◽  
And Storage ◽  
Common Situation

Along with the use of cloud-based services, infrastructure, and storage, the use of application logs in business critical applications is a standard practice. Application logs must be stored in an accessible manner in order to be used whenever needed. The debugging of these applications is a common situation where such access is required. Frequently, part of the information contained in logs records is sensitive. In this paper, we evaluate the possibility of storing critical logs in a remote storage while maintaining its confidentiality and server-side search capabilities. To the best of our knowledge, the designed search algorithm is the first to support full Boolean searches combined with field searching and nested queries. We demonstrate its feasibility and timely operation with a prototype implementation that never requires access, by the storage provider, to plain text information. Our solution was able to perform search and decryption operations at a rate of, approximately, 0.05 ms per line. A comparison with the related work allows us to demonstrate its feasibility and conclude that our solution is also the fastest one in indexing operations, the most frequent operations performed.

scholarly journals An optimized imaging protocol for [99mTc]Tc-DPD scintigraphy and SPECT/CT quantification in cardiac transthyretin (ATTR) amyloidosis

2021 ◽  
Author(s):  
Imke Schatka ◽  
Anne Bingel ◽  
Franziska Schau ◽  
Stephanie Bluemel ◽  
Daniel R. Messroghli ◽  
...  
Keyword(s):  
Field Of View ◽  
Imaging Protocol ◽  
Attr Amyloidosis ◽  
Visual Scoring ◽  
Cardiac Phantom ◽  
Phantom Measurements ◽  
Planar Images ◽  
Sensitivity Specificity ◽  
Additional Value ◽  
Detector Angle

Abstract Background In [99mTc]Tc-DPD scintigraphy for myocardial ATTR amyloidosis, planar images 3 hour p.i. and SPECT/CT acquisition in L-mode are recommended. This study investigated if earlier planar images (1 hour p.i.) are beneficial and if SPECT/CT acquisition should be preferred in H-mode (180° detector angle) or L-mode (90°). Methods In SPECT/CT phantom measurements (NaI cameras, N = 2; CZT, N = 1), peak contrast recovery (CRpeak) was derived from sphere inserts or myocardial insert (cardiac phantom; signal-to-background ratio [SBR], 10:1 or 5:1). In 25 positive and 38 negative patients (reference: endomyocardial biopsy or clinical diagnosis), Perugini scores and heart-to-contralateral (H/CL) count ratios were derived from planar images 1 hour and 3 hour p.i. Results In phantom measurements, accuracy of myocardial CRpeak at SBR 10:1 (H-mode, 0.95-0.99) and reproducibility at 5:1 (H-mode, 1.02-1.14) was comparable for H-mode and L-mode. However, L-mode showed higher variability of background counts and sphere CRpeak throughout the field of view than H-mode. In patients, sensitivity/specificity were ≥ 95% for H/CL ratios at both time points and visual scoring 3 hour. At 1 hour, visual scores showed specificity of 89% and reduced reader’s confidence. Conclusions Early DPD images provided no additional value for visual scoring or H/CL ratios. In SPECT/CT, H-mode is preferred over L-mode, especially if quantification is applied apart from the myocardium.

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