WE-FG-207B-12: Quantitative Evaluation of a Spectral CT Scanner in a Phantom Study: Results of Spectral Reconstructions

2016 ◽  
Vol 43 (6Part42) ◽  
pp. 3836-3837 ◽  
Author(s):  
X Duan ◽  
G Arbique ◽  
J Guild ◽  
Y Yagil ◽  
J Anderson
Keyword(s):  
Quantitative Evaluation ◽  
Phantom Study ◽  
Ct Scanner ◽  
Spectral Ct ◽  
Study Results

Abstract P105: Identification of Cardioembolic Sources and Myocardial Injury in Acute Ischemic Stroke With Delayed-Phase, Low-Dose Chest Ct by Means of a Dual-Layer Spectral Ct Scanner

Stroke ◽  
2021 ◽  
Vol 52 (Suppl_1) ◽  
Author(s):  
Gaston Rodriguez Granillo ◽  
Juan José Cirio ◽  
Ivan Lylyk ◽  
Nicolas Perez ◽  
Maria L Caballero ◽  
...  
Keyword(s):  
Myocardial Injury ◽  
Low Dose ◽  
Late Enhancement ◽  
Chest Ct ◽  
Ct Scans ◽  
Ct Scanner ◽  
Spectral Ct ◽  
Thrombotic Complications ◽  
The Mean ◽  
Delayed Phase

Background: The COVID-19 pandemic has promoted adaptations in diagnostic algorithms. We explored the feasibility and accuracy of delayed phase (DP) chest computed tomography (CT) performed immediately after brain CT perfusion (CTP) for the identification of thrombotic complications and myocardial fibrosis among patients admitted with acute ischemic stroke (AIS). Methods: Since July, we have incorporated the use of low dose chest CT scans using a spectral CT scanner in all patients admitted with AIS, encouraging acquisitions, five min after brain CTP. All scans were non gated and comprised low dose chest CT scans, without additional contrast. Using virtual monochromatic imaging and iodine maps, we evaluated the presence of thrombotic complications, myocardial late enhancement, and myocardial extracellular volume (ECV), as a surrogate of edema and interstitial fibrosis. Results: We included 22 patients. The mean age was 66.2±19.6 years. In 5 patients, a cardioembolic (CE) source was later identified by transesophageal echocardiogram (TEE), [left atrial appendage (LAA) thrombus, n=1], transthoracic echocardiogram with agitated saline injection (patent foramen ovale n=2), or by EKG (atrial fibrillation). Seven patients further underwent either TEE or cardiac CT to identify CE sources. DP non gated chest CT had a sensitivity and specificity of 100% to identify CE sources, 1 LAA thrombus correctly detected. Chest CT identified pulmonary thromboembolism (PE), later confirmed with CT angiography. Chest CT identified myocardial late enhancement in 16 patients (80% in CE vs. 71% in non CE, p=0.68), myocardial fat in 1, and coronary calcification in 77% [with 2.6±2.2 vs 3.8±3.6 coronary calcified segments in CE vs. non CE strokes, p=0.36). The mean ECV was 35±4% in CE vs 32±6% in non CE strokes (p=0.17). The 2 patients with a positive PCR test for COVID-19 showed evidence of myocardial late iodine enhancement, and incremented ECV of the septal wall (38% and 40%, respectively). Conclusions: In this pilot study, DP, non ECG gated, low dose chest CT scan performed 5 min after brain CTP with a spectral scanner; enabled straightforward identification of CE sources among patients with AIS. This approach allowed detection of PE and myocardial injury.

Implementation and quantitative evaluation of analytical methods for attenuation correction in SPECT: a phantom study

1999 ◽  
Vol 44 (10) ◽  
pp. 2643-2655 ◽  
Author(s):  
Hiroyuki Shinohara ◽  
Tomoaki Yamamoto ◽  
Yoshio Kuniyasu ◽  
Takeyuki Hashimoto ◽  
Takashi Yokoi
Keyword(s):  
Attenuation Correction ◽  
Quantitative Evaluation ◽  
Analytical Methods ◽  
Phantom Study

Pseudoenhancement effects on iodine quantification from dual-energy spectral CT systems: A multi-vendor phantom study regarding renal lesion characterization

2018 ◽  
Vol 105 ◽  
pp. 125-133 ◽  
Author(s):  
Todd C. Soesbe ◽  
Lakshmi Ananthakrishnan ◽  
Matthew A. Lewis ◽  
Xinhui Duan ◽  
Khaled Nasr ◽  
...  
Keyword(s):  
Dual Energy ◽  
Phantom Study ◽  
Renal Lesion ◽  
Spectral Ct ◽  
Iodine Quantification ◽  
Lesion Characterization

TU-EF-204-04: Feasibility Study of a Novel Stationary Spectral CT Scanner

2015 ◽  
Vol 42 (6Part34) ◽  
pp. 3620-3621
Author(s):  
P Xu ◽  
X Xing ◽  
J Zheng ◽  
S Chen ◽  
Y Zhang ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Ct Scanner ◽  
Spectral Ct

Noise characteristics of virtual monoenergetic images from a novel detector-based spectral CT scanner

2018 ◽  
Vol 98 ◽  
pp. 118-125 ◽  
Author(s):  
Kevin Kalisz ◽  
Negin Rassouli ◽  
Amar Dhanantwari ◽  
David Jordan ◽  
Prabhakar Rajiah
Keyword(s):  
Ct Scanner ◽  
Spectral Ct ◽  
Noise Characteristics ◽  
Virtual Monoenergetic Images ◽  
Monoenergetic Images

scholarly journals Examination of Optimal Window Size and Acquisition Time of Respiratory-gated PET Image: Phantom Study with a SiPM-based PET/CT Scanner

2020 ◽  
Vol 76 (8) ◽  
pp. 795-801
Author(s):  
Ryotaro Sato ◽  
Hayato Odagiri ◽  
Manami Ikawa ◽  
Hironobu Sasaki ◽  
Kentaro Takanami ◽  
...  
Keyword(s):  
Window Size ◽  
Phantom Study ◽  
Acquisition Time ◽  
Ct Scanner ◽  
Gated Pet ◽  
Pet Ct ◽  
Optimal Window

scholarly journals The effects of the skull on CT imaging of the brain: a skull and brain phantom study

2021 ◽  
Vol 94 (1119) ◽  
pp. 20200714
Author(s):  
Keith A Cauley ◽  
Patrick J Yorks ◽  
Sarah Flora ◽  
Samuel W Fielden
Keyword(s):  
Energy Source ◽  
Quantitative Imaging ◽  
Ct Imaging ◽  
Phantom Study ◽  
Ct Scanner ◽  
Beam Hardening ◽  
X Ray ◽  
The Brain ◽  
Brain Phantom ◽  
Clinical Cases

Objective: To investigate the effects of beam hardening by the skull on the measured radiodensity of the brain. To test a hypothesis that these effects of beam hardening are decreased using a monochromatic energy source. Methods: Selected clinical cases were reviewed in illustration. An anthropomorphic skull and brain phantom was created and scanned in a clinical CT scanner with skull, without skull, and with hemicraniectomy. The effects of beam hardening were illustrated by scanning the phantom with mono- and poly-chromatic X-ray sources. Results: In clinical cases, the HU values of the brain were consistently lower when the X-ray beam traversed the skull than when it did not. An anthropomorphic skull-and-brain phantom further demonstrated these effects, which were evident with a polychromatic energy source and absent with a virtual monochromatic energy source. Conclusions: Beam hardening by the skull lowers the measured HU values of the brain. The effects, which can impact quantitative imaging, may be mitigated by a virtual monochromatic energy source. Advances in knowledge: Beam hardening by the skull lowers the measured radiodensity of the brain. The effects may be mitigated by a virtual monochromatic energy source.

Quantitative Evaluation of Synthetic MR in Relaxation Time Measurement: A Phantom Study

2017 ◽  
Vol 27 (2) ◽  
pp. 13-24
Author(s):  
Jin-Seo Park ◽  
◽  
Seong-Ho Kim ◽  
In-Seong Kim ◽  
Chung-Hwan Kang ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Quantitative Evaluation ◽  
Time Measurement ◽  
Phantom Study ◽  
Relaxation Time Measurement

STUDY ON COMPUTED TOMOGRAPHY FINDINGS OF NASOPHARYNGEAL CARCINOMA

2011 ◽  
Author(s):  
Hung Phung ◽  
Minh Loi Hoang ◽  
Trong An Phan
Keyword(s):  
Nasopharyngeal Carcinoma ◽  
High Sensitivity ◽  
Cross Sectional Study ◽  
Ct Scanner ◽  
Sectional Study ◽  
Central Hospital ◽  
Cross Sectional ◽  
Study Results ◽  
Nasopharyngeal Tumors ◽  
Maxillary Sinuses

Objective: This study aims to characteristics of CT imaging in the diagnosis of nasopharyngeal carcinoma. Materials and method: 62 patients were hospitalized in Hue Central Hospital from May 2009 to May 2010. These patients were passed CT scanner and confirmed the nasopharyngeal carcinoma on pathology result. Cross-sectional study. Results: Site of tumor on lateral pharyngeal recess is 79.03%; all tumor enhanced by contrast medium and heterogenuos (90,32%); hypervascular (79,03%); intratumoral necrosis (14,52 %); abnormal Rosenmuller fossa (70,97%), Eustachian (64,51%); extending into the pterygomaxillary fossa (56,45%), the nasal cavity (33,87%); skull base erosion (14,52%), invades maxillary sinuses (12,90%), pterygomaxillary process (11,29%). Conclusion: Through this study, we found that CT imagings have many advantages in detecting nasopharyngeal tumors, and tumor position. CT technich is also a good assessment for invasive structures of anatomy around the nasopharynx, especially with the high sensitivity in detecting invasive bone and sinuses.

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