scholarly journals Experiences of using a single post-contrast CT scan of the chest after biphasic contrast injection

2012 ◽  
Vol 16 (2) ◽  
pp. 56-60
Author(s):  
Phillip Carl Pretorius
Keyword(s):  
Ct Scan ◽  
Arterial Phase ◽  
Contrast Injection ◽  
Post Contrast ◽  
Computed Tomographic ◽  
Scanning Technique ◽  
Contrast Ct

Computed tomographic chest investigations can be enhanced; in many cases, the arterial phase of a post-contrast arterial and delay (60 seconds) study can be omitted when planning the contrast injection and scanning technique carefully. A biphasic contrast injection was used before starting a single 60-second post-contrast scan.

scholarly journals Feline injection site sarcoma: computed-tomographic density and assessment of tumor dimensions by different methods

2017 ◽  
Vol 37 (10) ◽  
pp. 1113-1118
Author(s):  
Karen Maciel Zardo ◽  
Lucas Petri Damiani ◽  
Julia Maria Matera ◽  
Ana Carolina B.C. Fonseca-Pinto
Keyword(s):  
Physical Examination ◽  
Injection Site ◽  
Malignant Neoplasm ◽  
Hounsfield Unit ◽  
Ct Images ◽  
Post Contrast ◽  
Computed Tomographic ◽  
Definition Of ◽  
Ct Density ◽  
Contrast Ct

ABSTRACT: Feline injection site sarcoma is a malignant neoplasm with digitiform projections into muscular planes that are ill recognized during physical examination and may compromise tumor margin demarcation. This study compared tumoral size of 32 cats measured by different methods, and evaluated the CT density of 10 tumoral tissues (Hounsfield unit) based on histograms. Tumor axes were measured by physical examination and CT images. Larger craniocaudal axis measurements were obtained following multiplanar reconstruction of pre- and post-contrast CT images (p=0.049 and p=0.041 respectively); dorsoventral axis measurements taken from post-contrast CT images were also larger (p=0.010). Tumor volume estimates increased following contrast-enhancement. Histograms tended to produce two peaks: one in the fat and another in the soft tissue attenuation range. Multiplanar reconstructed post-contrast CT images provided clearer definition of tumor margins and more judicious determination of tumor size. A tendency of common FISS attenuation profile could be described.

scholarly journals Computed tomographic features of the feline brain change with advancing age?

2015 ◽  
Vol 35 (suppl 1) ◽  
pp. 33-38
Author(s):  
Viviam R. Babicsak ◽  
Guilherme S. Cardoso ◽  
Miriam H. Tsunemi ◽  
Luiz C. Vulcano
Keyword(s):  
Third Ventricle ◽  
Imaging Data ◽  
Falx Cerebri ◽  
Post Contrast ◽  
Computed Tomographic ◽  
Age Related ◽  
Left Lateral Ventricle ◽  
Mean Width ◽  
Contrast Ct ◽  
Age Related Changes

Abstract: A better understanding of normal or expected encephalic changes with increasing age in cats is needed as a growing number of these animals is attended in veterinary clinics, and imaging data referring to normal age-associated changes are extremely scarce in the literature. The objective of this study was to identify age-related changes in feline brain using CT imaging. Fifteen non-brachycephalic healthy cats with age between 1 to 6 years (adult group) and others over 12 years (geriatric group) were submitted to CT scan of the brain. Statistically significant differences were found between the groups for the ability to identify the left lateral ventricle and for falx cerebri calcification, both identified in a greater number of cats of the geriatric group. A significantly higher mean width of the third ventricle was also detected in geriatric animals. There were no statistically significant differences between lateral ventricular dimensions and encephalic parenchymal attenuation on pre and post-contrast CT phases. The results of the present study show an increase in the incidence of falx cerebri calcification and a third ventricular dilatation with advancing age in cats. Future researches using MRI scanners and a greater quantity of cats are needed in order to identify supplementary age-related changes.

Neuroradiological Detection of Small and Intracanalicular Acoustic Tumors: An Emphasis on CO2 Contrast-enhanced Computed Tomographic Cisternography

Neurosurgery ◽  
1982 ◽  
Vol 11 (6) ◽  
pp. 733-738 ◽  
Author(s):  
W. Craig Clark ◽  
James D. Acker ◽  
Jon H. Robertson ◽  
Gale Gardner ◽  
John J. Dusseau ◽  
...  
Keyword(s):  
Ct Scan ◽  
Temporal Bone ◽  
Intravenous Contrast ◽  
Ct Cisternography ◽  
Computed Tomographic ◽  
Contrast Enhanced ◽  
Acoustic Tumor ◽  
Contrast Ct

Abstract Seventy patients suspected clinically of having an acoustic tumor were evaluated using the computed tomographic (CT) scan as the initial neuroradiological procedure, followed by CO2 contrast CT cisternography in cases where the intravenous contrast-enhanced scan did not reveal any lesion. Forty-eight gas CT cisternograms revealed 10 small acoustic tumors, 2 of which were totally intracanalicular. The authors present a review of the basic CT anatomy of the temporal bone as it relates to acoustic tumors. Based upon the ease of performance of the procedure, the low postexamination morbidity, and the excellent diagnostic results, CO2 CT cisternography is recommended as the procedure of choice in the diagnosis of small and intracanalicular acoustic tumors.

scholarly journals Predicting the COVID-19 patients’ status using chest CT scan findings: A risk assessment model based on Decision tree

2021 ◽  
Author(s):  
Atefeh Talebi ◽  
Nasrin Borumandnia ◽  
Ramezan Jafari ◽  
Mohamad Amin Pourhoseingholi ◽  
Nematollah Jonaidi Jafari ◽  
...  
Keyword(s):  
Decision Tree ◽  
Ct Scan ◽  
Regression Tree ◽  
Assessment Model ◽  
Classification And Regression Tree ◽  
Factors Affecting ◽  
Computed Tomographic ◽  
The Status ◽  
And Gender ◽  
Contrast Ct

Abstract Background: The role of chest computed tomographic (CT) to diagnosis coronavirus disease-2019 (COVID-19) is still an open field to be explored. The aim of this study was to apply the decision tree (DT) model to predict critical or non-critical status of patients infected with COVID-19 based on available information on non-contrast CT scan.Method: This study was performed onpatients with COVID-19 who underwent chest CTscan atBaqiyatallahHospital, Tehran, Iran. In this retrospectivestudy, the medical records of 1078 patients with COVID-19 were evaluated. The classification and regression tree (CART) of decision treemodeland k-fold cross validation were used to predict the status of patients and to measure their sensitivity, specificity and area under curve (AUC).Results: Data included 169 critical cases and 909 non-critical cases. The bilateral distribution and multifocal lung involvement were165 (97.6%) and 766 (84.3%) in critical patients, respectively.According to DT model, total opacity score, age, lesion types and gender were statistically significant predictors incritical patients.Moreover, the results showed that the accuracy, sensitivity and specificity of the DT model were 93.3%, 72.8% and 97.1%, respectively.Conclusions: The presented algorithm demonstrates the factors affecting the patient's condition. In addition, this model has the potential characteristics for clinical applicationsand canalso identify high-risk subpopulations that need specific prevention.

Bubble study as a medium of contrast for computerized tomography coronary angiography. (Preprint)

2020 ◽  
Author(s):  
Vijay Shah ◽  
Justyn Huang
Keyword(s):  
Pulmonary Artery ◽  
Diagnostic Yield ◽  
Negative Contrast ◽  
Hounsfield Unit ◽  
Hounsfield Units ◽  
Computed Tomographic ◽  
Invasive Test ◽  
Clinical Difference ◽  
Contrast Ct ◽  
Scan Protocol

BACKGROUND Computed tomographic coronary angiogram (CTCA) is a non-invasive test with a negative predictive value of nearly 100% for the detection of coronary artery study. While diagnostic yield of a dedicated CTCA with bubble contrast is not yet evaluated OBJECTIVE To assess the diagnostic performance of injected bubble contrast and ability to measure difference in hounsfield units and use it as a "negative contrast" in computed tomographic METHODS This is a single center, single patient study. Baseline acquisition of a non-contrast CT scan was acquired to get hounsfield unit count in the aorta and pulmonary artery- (Calcium scan protocol) 1.4 mGy (19.5 mGy/cm). Secondly, Echo contrasts (Definity) - 5mls was injected and an echocardiogram confirmed filling in the aortic region. Finally, bubble contrast (1ml air, 8mls water and 1mls blood was drawn up and agitated through a 3 way tap) - was injected, a timing run was initiated to calculate for the bubbles to opacity the pulmonary artery. The same scan protocol was used– 1.4 mGy (19.5 mGy/cm). RESULTS Hounsfield units’ difference in the aorta and pulmonary artery from baseline compared to echo contrast and bubble contrast were not significant. CONCLUSIONS We believe this is the first ever recorded case to use bubbles as CT contrast. While results were not significant, secondary to small volume of bubbles injected. Further research needs to be implemented to assess clinical difference with amount of bubbles and volume required. CLINICALTRIAL Single centre study

scholarly journals Ferumoxytol-enhanced MR imaging for differentiating intrapancreatic splenules from other tumors

2020 ◽  
Author(s):  
M. R. Muehler ◽  
V. R. Rendell ◽  
L. L. Bergmann ◽  
E. R. Winslow ◽  
S. B. Reeder
Keyword(s):  
Superparamagnetic Iron Oxide ◽  
Pancreatic Neuroendocrine Tumor ◽  
Symptomatic Patient ◽  
Splenic Tissue ◽  
Pancreatic Lesion ◽  
Delayed Imaging ◽  
Post Contrast ◽  
Computed Tomographic ◽  
Institutional Experience ◽  
Slow Intravenous Infusion

Abstract Objectives Ferumoxytol is an ultra-small superparamagnetic iron oxide (USPIO) agent that is taken up by splenic tissue. This study describes our initial institutional experience of ferumoxytol-enhanced MRI (feMRI) for differentiating intrapancreatic splenules (IPS) from other pancreatic lesions. Methods In this retrospective study, patients with computed tomographic imaging that identified small enhancing lesions in the tail of the pancreas subsequently underwent feMRI for further characterization. The feMRI protocol included T2-weighted (T2w) imaging with and without fat suppression (FS), R2* mapping, diffusion-weighted imaging (DWI), and T1-weighted (T1w) imaging with FS, prior to contrast injection. Immediately after slow intravenous infusion with 3 mg/kg body weight ferumoxytol, T1w was repeated. Delayed imaging with all sequences were obtained 24–72 h after ferumoxytol administration. Results Seven patients underwent feMRI. In two patients, the pancreatic lesions were presumed as pancreatic neuroendocrine tumor (PNET) from feMRI and in the remaining 5 IPS. One of the two patients with PNET was symptomatic for NET. In another symptomatic patient with pathologically proven duodenal NET and suspected PNET, the pancreatic lesion was proven to be an IPS on feMRI. IPS demonstrated strong negative enhancement in feMRI on T2w and increased R2* values consistent with splenic tissue, while the presumed PNETs did not enhance. T2w FS was helpful on the pre-contrast images to identify IPS, while R2* did on post-contrast images. Neither DWI nor T1w contributed to differentiating PNETs from IPS. Conclusions This study demonstrates the potential utility of feMRI as a helpful adjunct diagnostic tool for differentiating IPS from other pancreatic lesions. Further studies in larger patient cohorts are needed.

scholarly journals Multi-factorial considerations for intra-thoracic lymph node evaluations of healthy cats on computed tomographic images

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Ninlawan Thammasiri ◽  
Chutimon Thanaboonnipat ◽  
Nan Choisunirachon ◽  
Damri Darawiroj
Keyword(s):  
Lymph Node ◽  
Lymph Nodes ◽  
Ct Images ◽  
Slice Thickness ◽  
Maximum Width ◽  
Post Contrast ◽  
Computed Tomographic ◽  
Contrast Enhanced Ct ◽  
Contrast Enhanced ◽  
Enhanced Ct

Abstract Background It is difficult to examine mild to moderate feline intra-thoracic lymphadenopathy via and thoracic radiography. Despite previous information from computed tomographic (CT) images of intra-thoracic lymph nodes, some factors from animals and CT setting were less elucidated. Therefore, this study aimed to investigate the effect of internal factors from animals and external factors from the CT procedure on the feasibility to detect the intra-thoracic lymph nodes. Twenty-four, client-owned, clinically healthy cats were categorized into three groups according to age. They underwent pre- and post-contrast enhanced CT for whole thorax followed by inter-group evaluation and comparison of sternal, cranial mediastinal, and tracheobronchial lymph nodes. Results Post contrast-enhanced CT appearances revealed that intra-thoracic lymph nodes of kittens were invisible, whereas the sternal, cranial mediastinal, and tracheobronchial nodes of cats aged over 7 months old were detected (6/24, 9/24 and 7/24, respectively). Maximum width of these lymph nodes were 3.93 ± 0.74 mm, 4.02 ± 0.65 mm, and 3.51 ± 0.62 mm, respectively. By age, lymph node sizes of these cats were not significantly different. Transverse lymph node width of males was larger than that of females (P = 0.0425). Besides, the detection score of lymph nodes was affected by slice thickness (P < 0.01) and lymph node width (P = 0.0049). Furthermore, an irregular, soft tissue structure, possibly the thymus, was detected in all juvenile cats and three mature cats. Conclusions Despite additional information on intra-thoracic lymph nodes in CT images, which can be used to investigate lymphatic-related abnormalities, age, sex, and slice thickness of CT images must be also considered.

Infections of the Aorta: Case Report and Review of Treatment

Vascular ◽  
2005 ◽  
Vol 13 (4) ◽  
pp. 252-256 ◽  
Author(s):  
Shannon Lehner ◽  
Catherine Wittgen
Keyword(s):  
Back Pain ◽  
Case Report ◽  
Ct Scan ◽  
Rapid Development ◽  
Compression Fracture ◽  
Lower Lobe ◽  
Computed Tomographic ◽  
Emergent Operation ◽  
Surgical Options

Radiographic documentation of the rapid development of an aortic infection has not previously been reported. We report the case of a 68-year-old woman who presented with back pain. A computed tomographic(CT) scan documented a nondisplaced L1 compression fracture as well as an atherosclerotic but nonaneurysmal aorta. Two weeks after discharge, she developed left lower lobe pneumonia and was readmitted. A second CT scan was obtained because of continuous complaints of back pain. A contained rupture of the visceral aorta was now clearly visible. Emergent operation successfully repaired her aorta. The microorganisms responsible for aortic infection have changed since the widespread use of antibiotics. Patterns of aortic involvement have also evolved. The difficulty in making these diagnoses, the role of current antibiotic therapy, and the surgical options for these infections will be discussed.

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