However, the use of lower concentration contrast media for cardiac CTA requires high injection rates and thus large needles that can facilitate these high injection rates.
This has important implications for a diagnostic scan, especially pulmonary CTA as the injection may not occur at the peak rate planned thus leading to suboptimal opacification.
There is an almost linear relationship between enhancement and iodine concentration, which makes CM preparations with a high iodine concentration ideal (preferably 350-400 mg/ml) for CTA when the injection rate is fixed, resulting in a higher iodine delivery rate.
One patient was excluded because of renal failure and one patient had to be excluded because of a technical failure of contrast injection during CTA.
For identification of possible arterial bleeding, arteriovenous fistula or RPA CT angiography (CTA) was performed with injection of 105 mL contrast media (Imeron 400 MCT 400 mg iodine/mL; Bracco Imaging Germany) using a peripheral venous access with a flow rate of 4 mL/s, followed by a saline injection of 40 mL with identical flow rate.
A non-diagnostic CTA following the initial contrast injection can be secondary to many causes; these include both extrinsic factors, such as injection technique/equipment failure (iv cannula, power injector), and intrinsic, patient-related factors.
Anteroposterior projection angiogram (two-dimensional [2D]) and 3D cone-beam CTA images were acquired by injection of the common hepatic artery.
Interestingly, CNQX micro-injection into the IC 2 hr after the taste consumption in 3 hr ITI-CTA learning also attenuated CTA memory.
The purpose of this crossover, prospective, randomized clinical trial was to compare the clinical effectiveness of a CTA with that of a needle injection of local anesthetic for miniscrew placement.
The purpose of this study is to reduce the administered contrast medium volume in abdominal CTA by using a test bolus injection, with the preservation of adequate quantitative and qualitative vessel enhancement.
