Accuracy of MRI-compatible contrast media injectors.
Rofo
; 186(3): 253-9, 2014 Mar.
Article
em En
| MEDLINE
| ID: mdl-24142438
ABSTRACT
PURPOSE:
To analyze the exactness of MRI-compatible contrast media (CM) injectors in an experimental setup and clinical use. MATERIALS ANDMETHODS:
Ejected fluid volumes and amounts of CM were quantified for single and double piston injections. The focus was on small volumes, as used in pediatric examination and test-bolus measurements. Samples were collected before and after clinical MRI scans and amounts of CM were measured.RESULTS:
For single piston injections the volume differences were minimal (mean difference 0.01â ml). For double piston injections the volume of the first injection was decreased (mean 20.74 âml, target 21.00 âml, pâ<â0.01). After a position change of the Y-piece of the injection system, the amount of CM differed significantly from the target value (mean 1.23 âmmol and 0.83 âmmol at 1 âml/s flow rate, target 1.00â mmol, pâ<â0.01), independently of the wait time. The clinical samples confirmed these findings.CONCLUSION:
The pistons of modern CM injectors work exactly. However, for small CM volumes the injected amount of CM can differ significantly from the target value in both directions. Influence factors are an incomplete elimination of air and exchange processes between the CM and saline chaser in the injection system. KEY POINTS â¢âIn MRI examinations of children and test-bolus measurements, small amounts of CM are used. â¢âThe accuracy of single piston injections is high. â¢âIn double piston injections the injected amount of CM can differ significantly from the target value.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Seringas
/
Imageamento por Ressonância Magnética
/
Meios de Contraste
/
Injeções Intravenosas
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article