Axial computed tomography of a male pelvis in the portal venous phase post-contrast

BMJ ◽  
2012 ◽  
Vol 345 (oct01 2) ◽  
pp. e6433-e6433
Author(s):  
R. H. Kassamali ◽  
S. J. Karia
Keyword(s):  
Computed Tomography ◽  
Post Contrast ◽  
Portal Venous Phase ◽  
Venous Phase

scholarly journals Non-contrast and portal venous phase computed tomography in breast cancer hepatic metastases: comparison of tumor measurements and impact on response assessment

2021 ◽  
Vol 10 (2) ◽  
pp. 205846012199801
Author(s):  
Brian Flemming ◽  
Mark D Kovacs ◽  
Andrew Hardie ◽  
Melissa Picard ◽  
Philip F Burchett ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Computed Tomography ◽  
Hepatic Metastases ◽  
Lesion Size ◽  
Breast Cancer Patients ◽  
Contrast Imaging ◽  
Post Contrast ◽  
Portal Venous Phase ◽  
Phase Images ◽  
Venous Phase

Background For many common malignancies, including breast cancer, evaluation for metastatic disease using multiphase computed tomography (CT) has fallen out of favor and been replaced by studies performed only in the portal venous phase. However, differences in tumor vascularity could produce differences in appearance on post-contrast imaging. Purpose To assess non-contrast phase and portal venous phase computed tomography in detection and measurement of hepatic metastases from breast carcinoma. Materials and Methods A total of 75 CT scans from 52 breast cancer patients were independently assessed by three body imagers for lesion presence, number and size. Readers randomly assessed portal venous phase or combined phase images at one session with cross-over reads performed four to six weeks later. Results In the 58% of cases where index lesions measured larger on combined phase, the mean difference in lesion size was 5.7 mm. In this group, combined phase reads demonstrated an 8.4 mm increase in sum of largest diameters, and a mean percentage sum of largest diameters increase of 19% compared to portal venous phase-only reads. Conclusion Addition of non-contrast phase images results in increased index lesion size in most patients with hepatic metastases from breast cancer. If only the portal venous phase is utilized, there is potential for incorrectly diagnosing disease progression on follow-up due to underestimation of lesion size.

Virtual Monoenergetic Images From a Novel Dual-Layer Spectral Detector Computed Tomography Scanner in Portal Venous Phase

2018 ◽  
Vol 42 (3) ◽  
pp. 350-356 ◽  
Author(s):  
Tilman Hickethier ◽  
Andra-Iza Iuga ◽  
Simon Lennartz ◽  
Myriam Hauger ◽  
Jonathan Byrtus ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Portal Venous Phase ◽  
Venous Phase ◽  
Virtual Monoenergetic Images ◽  
Computed Tomography Scanner ◽  
Monoenergetic Images

Value of CT Imaging in the Differentiation of Gastric Leiomyoma From Gastric Stromal Tumor

2020 ◽  
pp. 084653711988567
Author(s):  
Jian Wang ◽  
Xiaoxuan Zhou ◽  
Fangyi Xu ◽  
Weiqun Ao ◽  
Hongjie Hu
Keyword(s):  
Computed Tomography ◽  
Multivariate Logistic Regression Analysis ◽  
Fisher Exact Test ◽  
Exact Test ◽  
Portal Venous Phase ◽  
Ct Value ◽  
Unenhanced Ct ◽  
Gastric Stromal Tumor ◽  
Venous Phase ◽  
Gastric Leiomyoma

Purpose: To discuss significant computed tomography (CT) findings that differentiate gastric leiomyomas (GLs) from small gastric stromal tumors (GSTs). Methods: One hundred sixty cases with pathologically proven GLs (n = 50) and GSTs (n = 110) with comprehensive CT images were enrolled in this retrospective study. Computed tomography findings (ie, size, location, contour, growth pattern, enhancement degree, necrosis, ulceration, calcification, and lymph nodes) were analyzed through the χ2 or Fisher exact test, independent T test, and multivariate (logistic regression) analysis. Sensitivity and specificity were also calculated. Results: Features of cardia location, endophytic growth, homogeneous gradual enhancement, absent of necrosis, long diameter less than 24 mm, short diameter less than 20 mm, unenhanced CT value larger than 35.2 Hounsfield units (HU), portal venous phase CT value larger than 67.4 HU, and enhancement degree of arterial and venous phase less than 16.2 HU and 32.4 HU were found to be statistically significant between GLs and small GSTs ( P < .05). On multivariate analysis, cardia location, endophytic growth, and homogeneous gradual enhancement were independent predictive factors for GLs and small GSTs. Conclusion: These 10 CT criteria are very helpful to differentiate GLs from small GSTs. Especially cardia location, endophytic growth, and homogeneous gradual enhancement are of high value in differential diagnosis.

Aortic and Hepatic Contrast Enhancement During Hepatic-Arterial and Portal Venous Phase Computed Tomography Scanning

2017 ◽  
Vol 41 (2) ◽  
pp. 309-314 ◽  
Author(s):  
Takanori Masuda ◽  
Takeshi Nakaura ◽  
Yoshinori Funama ◽  
Toru Higaki ◽  
Masao Kiguchi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contrast Enhancement ◽  
Portal Venous Phase ◽  
Computed Tomography Scanning ◽  
Venous Phase ◽  
Tomography Scanning

ROLE OF MULTIPHASE STUDY OF LIVER LESIONS ON 128 SLICE DUAL SOURCE COMPUTED TOMOGRAPHY (CT) WITH CYTOLOGY OR HISTOPATHOLOGICAL CORRELATION

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Nisma Waheed ◽  
Rajneesh Madhok ◽  
Ashish Kumar Gupta ◽  
Tanu Agarwal
Keyword(s):  
Computed Tomography ◽  
Radiology Department ◽  
Arterial Phase ◽  
Liver Lesions ◽  
Common Pattern ◽  
Portal Venous Phase ◽  
Histopathological Correlation ◽  
Dual Source ◽  
Venous Phase ◽  
Delayed Scan

Introduction: Dual source Multidetector Computed Tomography (MDCT) provides multiphase study of various liver lesions for better detection and characterization. This study aims to detect and characterize the liver lesions in multiphase Computed Tomography (CT) with cytological and histopathological correlation to confirm the diagnosis. Material and Methods: This cross-sectional study included 65 patients who were referred to the Radiology Department of Shri Ram Murti Smarak Institute of Medical Sciences, Bareilly, Uttar Pradesh, India with clinical features jaundice, pain in abdomen, nausea and vomiting. All patients were evaluated by five phase CT (unenhanced, early and late arterial, portal venous and delayed scan) of liver with Siemens128 slice dual source spiral CT. Protocols with a scan delay of 06 seconds, 09 seconds, 45 seconds and 180-300 seconds from contrast bolus was preselected for early and late arterial, portovenous and delayed scans. Results: Sixty five (age 10yrs- 90yrs) patients were included in the study. Most common neoplasm was metastases 33(51%). Hepatocellular carcinoma (HCC) were 18(28%), hemangioma 10(15%), peripheral intrahepatic cholangiocarcinoma 1 and 3 were non-neoplastic which included hepatic abscesses and hydatid cyst. Most common pattern of enhancement of metastasis in arterial phase was hypodense with peripheral enhancement and most were hypodense in portal venous phase. Portal venous phase had highest grade for hypovascular metastases and arterial phase had high grade to detect hypervascular metastasis. Delayed scan was better for smaller lesions less than 1cm. The sensitivity to detect metastases was 94%. Most common pattern of enhancement in HCC (variegated or heterogeneous enhancement in arterial phase with rapid washout in the portal venous phase. Total sensitivity to detect HCC was 83.3%. Hemangioma showed peripheral globular enhancement in arterial phase. In portal venous and delayed phase showed progressive enhancement with more centripetal filling. Sensitivity was 90% in case of hemangiomas. Conclusion: Multiphasic CT scan is a good non-invasive tool and can be used as first line imaging modality for differentiating benign and malignant liver lesions.

Evaluation of equivocal small cystic pancreatic lesions with spectral-detector computed tomography

2020 ◽  
pp. 028418512091711
Author(s):  
Kai Roman Laukamp ◽  
Sree Harsha Tirumani ◽  
Simon Lennartz ◽  
Nils Große Hokamp ◽  
Amit Gupta ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Intraclass Correlation ◽  
Observer Agreement ◽  
Portal Venous Phase ◽  
Additional Information ◽  
Contrast Enhanced ◽  
Radiological Report ◽  
Venous Phase ◽  
Cystic Pancreatic Lesions ◽  
Lesion Conspicuity

Background Evaluation of small cystic lesions of the pancreas remains a challenging task, as due to their size appearance can be rather hypodense than clearly fluid-filled. Purpose To evaluate whether additional information provided by novel dual-layer spectral-detector computed tomography (SDCT) imaging can improve assessment of these lesions. Material and Methods For this retrospective study, we reviewed reports of 1192 contrast-enhanced portal-venous phase SDCT scans of the abdomen conducted between May 2017 and January 2019. On basis of the radiological report 25 small (≤1.5 cm) cystic pancreatic lesions in 22 patients were identified, in which additional short-term follow-up imaging was recommended to confirm/clarify cystic nature. Conventional images (CI) and spectral images (SI) including virtual-monoenergetic images at 40 keV (VMI), iodine-density and iodine-overlay images were reconstructed. Two readers indicated lesion conspicuity and confidence for presence of cystic nature on three-point scales. First, solely CI were evaluated, while in a second reading after a four-week interval, the combination of CI and corresponding SI were reviewed. Quantitatively, ROI-based mean attenuation was measured in CI and VMI. Results In the subjective reading, SI significantly improved lesion conspicuity (CI 2 [1–2], SI 3 [2–3], P < 0.001) and confidence regarding presence of cystic nature (CI 2 [1–2], SI 3 [3–3], P < 0.001). Inter-observer agreement depicted by intraclass correlation coefficient improved considerably from 0.51 with only CI to 0.85 when the combination with SI was used. Further, VMI displayed significantly higher signal-to-noise (CI 1.2 ± 0.8, VMI 3.2 ± 1.8, P < 0.001) and contrast-to-noise ratios (CI 2.6 ± 0.8, VMI 4.7 ± 1.9). Conclusion Compared to CI alone, combination with SI significantly improves visualization and confidence in evaluation of small equivocal cystic pancreatic lesions.

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