Purpose: The aim of this article was to investigate the opacification of the renal vasculature and the urogenital system during computed tomography urography by using a quadruple-phase contrast media in a triphasic scan protocol.
Materials And Methods: A total of 200 patients with possible urinary tract abnormalities were equally divided between 2 protocols. Protocol A used the conventional single bolus and quadruple-phase scan protocol (pre, arterial, venous, and delayed), retrospectively. Protocol B included a quadruple-phase contrast media injection with a triphasic scan protocol (pre, arterial and combined venous, and delayed), prospectively. Each protocol used 100 mL contrast and saline at a flow rate of 4.5 mL. Attenuation profiles and contrast-to-noise ratio of the renal arteries, veins, and urogenital tract were measured. Effective radiation dose calculation, data analysis by independent sample t test, receiver operating characteristic, and visual grading characteristic analyses were performed.
Results: In arterial circulation, only the inferior interlobular arteries in both protocols showed a statistical significance (P < 0.05). Venously, the inferior vena cava, proximal and distal renal veins demonstrated a significant opacification reduction in protocol B than in protocol A (P < 0.001). Protocol B showed a significantly higher mean contrast-to-noise ratio than protocol A (protocol B: 22.68 ± 13.72; protocol A: 14.75 ± 5.76; P < 0.001). Radiation dose was significantly reduced in protocol B (7.38 ± 2.22 mSv) than in protocol A (12.28 ± 2.72 mSv) (P < 0.001). Visual grading characteristic (P < 0.027) and receiver operating characteristic (P < 0.0001) analyses demonstrated a significant preference for protocol B.
Conclusions: In computed tomography urography, augmented quadruple-phase contrast media and triphasic scan protocol usage increases the image quality at a reduced radiation dose.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1097/RCT.0000000000000674 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Confirmed and presumed canine insulinomas and their presumed metastases are most conspicuous in the late arterial phase in a triple arterial phase CT protocol.
Vet Radiol Ultrasound
September 2023
The Department of Small Animal Diagnostic Imaging, Queen Mother Hospital for Animals, Hawkshead Lane, Hertfordshire, Hatfield, United Kingdom.
Arterial enhancement is the commonly described characteristic of canine insulinomas in contrast-enhanced computed tomography (CECT). However, this finding is also reported as inconsistent. The main aim of this single-center retrospective observational study was to describe the contrast enhancement (CE) pattern of canine presumed and confirmed insulinomas and presumed metastases in three consecutive (early, mid, and late) arterial phases.
View Article and Find Full Text PDFPurpose: The aim of this article was to investigate the opacification of the renal vasculature and the urogenital system during computed tomography urography by using a quadruple-phase contrast media in a triphasic scan protocol.
Materials And Methods: A total of 200 patients with possible urinary tract abnormalities were equally divided between 2 protocols. Protocol A used the conventional single bolus and quadruple-phase scan protocol (pre, arterial, venous, and delayed), retrospectively.
Comparison of Standard and Quadruple-Phase Contrast Material Injection for Artifacts, Image Quality, and Radiation Dose in the Evaluation of Head and Neck Cancer Metastases.
Radiology
May 2016
From the Department of Diagnostic Radiology, American University of Beirut Medical Center, PO Box 11-0236, Riad El Solh, Beirut 1107 2020, Lebanon (C.S., F.E.); Department of Radiology, Campbelltown Public Hospital, Campbelltown, NSW, Australia (A.M.); Discipline of Medical Radiation Sciences, University of Sydney, Lidcombe, NSW, Australia (P.C.B.); and Department of Diagnostic Radiology, Johns Hopkins Hospital, Baltimore, Md (D.Y.).
Article Synopsis
- The study aimed to compare two CT scan protocols for visualizing head and neck blood vessels during imaging of supraclavicular lymph nodes, focusing on how effectively they enhance vascular opacification.
- Involving 180 patients, the research tested protocol A (a single-bolus injection) against protocol B (a quadruple-phase dual-injection of contrast and saline), measuring the clarity of arteries and veins.
- Results showed protocol B significantly improved arterial visibility by 20%, reduced venous visibility by 75%, and provided better overall image quality (higher contrast ratios) while also reducing the effective radiation dose for patients.
Hepatocellular carcinoma (HCC) is an important cause of cancer-related death worldwide. If the disease is detected early, the treatment is more likely to be curative. This article discusses the current evidence regarding the surveillance and diagnosis of HCC, focusing on recent articles and the recommendations of the American Association for the Study of Liver Diseases (AASLD), which are briefly compared with the recommendations of other liver disease organizations.
View Article and Find Full Text PDFUsing low tube voltage (80kVp) quadruple phase liver CT for the detection of hepatocellular carcinoma: two-year experience and comparison with Gd-EOB-DTPA enhanced liver MRI.
Eur J Radiol
April 2012
Department of Radiology, Korea University Guro Hospital, Korea University College of Medicine, 80 Guro-dong, Guro-gu, Seoul 152-703, South Korea.
Purpose: To validate the diagnostic performance of quadruple phase low tube voltage liver CT through the comparison with Gd-EOB-DTPA enhanced liver MRI for the detection of HCC.
Materials And Methods: Non-obese patients (38 men, eight women) with 68 HCCs underwent quadruple-phase CT at 16 MDCT (using low tube voltage, 80kVp; moderately high tube current, 280mAs) and Gd-EOB-DTPA-enhanced 3T MRI. Three observers independently and randomly reviewed the CT and MR images on a tumor-by-tumor basis.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!