Comparison of three-dimensional negative-contrast CT cholangiopancreatography with three-dimensional MR cholangiopancreatography for the diagnosis of obstructive biliary diseases

2012 ◽  
Vol 81 (5) ◽  
pp. 830-837 ◽  
Author(s):  
Zhui-Yang Zhang ◽  
Dong Wang ◽  
Jian-Ming Ni ◽  
Xiang-Rong Yu ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Negative Contrast ◽  
Mr Cholangiopancreatography ◽  
Biliary Diseases ◽  
Contrast Ct

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

Insight into Bile Duct Reaction to Obstruction from a Three-dimensional Perspective Using ex Vivo Phase-Contrast CT

Radiology ◽  
2021 ◽  
pp. 203967
Author(s):  
Wen-Juan Lv ◽  
Xin-Yan Zhao ◽  
Dou-Dou Hu ◽  
Xiao-Hong Xin ◽  
Li-Li Qin ◽  
...  
Keyword(s):  
Bile Duct ◽  
Phase Contrast ◽  
Ex Vivo ◽  
Three Dimensional ◽  
Contrast Ct ◽  
Insight Into

scholarly journals A feasibility study of X-ray phase-contrast mammographic tomography at the Imaging and Medical beamline of the Australian Synchrotron

2015 ◽  
Vol 22 (6) ◽  
pp. 1509-1523 ◽  
Author(s):  
Yakov I. Nesterets ◽  
Timur E. Gureyev ◽  
Sheridan C. Mayo ◽  
Andrew W. Stevenson ◽  
Darren Thompson ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Contrast Imaging ◽  
Detector Resolution ◽  
X Ray ◽  
Processing Strategies ◽  
Characteristics Analysis ◽  
Tissue Characteristics ◽  
Contrast Ct

Results are presented of a recent experiment at the Imaging and Medical beamline of the Australian Synchrotron intended to contribute to the implementation of low-dose high-sensitivity three-dimensional mammographic phase-contrast imaging, initially at synchrotrons and subsequently in hospitals and medical imaging clinics. The effect of such imaging parameters as X-ray energy, source size, detector resolution, sample-to-detector distance, scanning and data processing strategies in the case of propagation-based phase-contrast computed tomography (CT) have been tested, quantified, evaluated and optimized using a plastic phantom simulating relevant breast-tissue characteristics. Analysis of the data collected using a Hamamatsu CMOS Flat Panel Sensor, with a pixel size of 100 µm, revealed the presence of propagation-based phase contrast and demonstrated significant improvement of the quality of phase-contrast CT imaging compared with conventional (absorption-based) CT, at medically acceptable radiation doses.

Improvement of MR cholangiopancreatography at .5 T: Three-dimensional half-averaged single-shot fast spin echo with multi-breath-hold technique

1998 ◽  
Vol 8 (2) ◽  
pp. 459-466 ◽  
Author(s):  
Tomoaki Ichikawa ◽  
Hiroki Haradome ◽  
Hideto Hanaoka ◽  
Yosimori Kassai ◽  
Toshiaki Nitatori ◽  
...  
Keyword(s):  
Spin Echo ◽  
Three Dimensional ◽  
Fast Spin Echo ◽  
Breath Hold ◽  
Single Shot ◽  
Mr Cholangiopancreatography ◽  
Fast Spin

Giant vertebro-basilar aneurysm: an unusual cerebello-pontine angle lesion

2006 ◽  
Vol 120 (2) ◽  
pp. 1-3 ◽  
Author(s):  
Sudhakiran Kalavagunta ◽  
Apostolos Karkanevatos ◽  
Andrew C Swift
Keyword(s):  
Mr Angiography ◽  
Rare Case ◽  
Three Dimensional ◽  
Digital Subtraction ◽  
Post Contrast ◽  
Acoustic Neuromas ◽  
Dimensional Reconstruction ◽  
Diagnostic Difficulties ◽  
Contrast Ct ◽  
Mr Sequences

Acoustic neuromas (vestibular schwannomas) comprise more than 90 per cent of all cerebello-pontine angle (CPA) lesions. We present a rare case of a giant vertebro-basilar aneurysm presenting as a CPA lesion. The general condition of the patient precluded the completion of the magnetic resonance (MR) sequences. The clinical and limited radiological results (T2 images alone, the features of which were not specific) initially did not lead to a specific diagnosis. To obtain further radiological information a computed tomography (CT) scan with contrast was performed and this revealed the lesion to be an aneurysm. The diagnostic difficulties and the treatment dilemmas of such a lesion are discussed. The importance of fine, axial, post-contrast CT arteriography with three-dimensional reconstruction, MR angiography and digital subtraction angiography are highlighted. The limitations of MR imaging in patients with CPA lesions are discussed.

Sign in / Sign up

Export Citation Format

Share Document