scholarly journals Optimal dilution of contrast medium for quantitating parenchymal blood volume using a flat-panel detector

2017 ◽  
Vol 46 (1) ◽  
pp. 464-474 ◽  
Author(s):  
Takumi Kuriyama ◽  
Nobuyuki Sakai ◽  
Mikiya Beppu ◽  
Chiaki Sakai ◽  
Hirotoshi Imamura ◽  
...  
Keyword(s):  
Contrast Medium ◽  
Blood Volume ◽  
Cerebral Blood Volume ◽  
Therapeutic Interventions ◽  
Flat Panel ◽  
Flat Panel Detector ◽  
Perfusion Studies ◽  
Power Injector ◽  
Before And After ◽  
Parenchymal Blood Volume

Objective Similar to perfusion studies after acute ischemic stroke, measuring cerebral blood volume (CBV) via C-arm computed tomography before and after therapeutic interventions may help gauge subsequent revascularization. We tested serial dilutions of intra-arterial injectable contrast medium (CM) to determine the optimal CM concentration for quantifying parenchymal blood volume by flat-panel detector imaging (FD-PBV). Methods CM was diluted via saline power injector, instituting time delays for FD-PBV studies. A red/green/blue (RGB) color scale was employed to quantify/compare FD-PBV and magnetic resonance-derived CBV (MRCBV). Results Contrast values of right and left common carotid arteries did not differ significantly at CM dilutions of ≥20%. RGB analysis of FD-PBV imaging (relative to MR-CVB), showed CM dilution altered the colors (by 16%), increasing red and decreasing blue ratios. Conclusion Diluting CM to 20% resulted in no laterality differential of FD-PBV imaging, with left/right quantitative ratios approaching 1.1 (optimal for clinical use).

scholarly journals In-Room Assessment of Cerebral Blood Volume for Guidance during Intra-Arterial Thrombolytic Therapy

2012 ◽  
Vol 18 (4) ◽  
pp. 463-468 ◽  
Author(s):  
C-J. Lin ◽  
M. Yu ◽  
S-C. Hung ◽  
M.M.H. Teng ◽  
W-Y. Guo ◽  
...  
Keyword(s):  
Thrombolytic Therapy ◽  
Blood Volume ◽  
Cerebral Blood Volume ◽  
Endovascular Procedures ◽  
Flat Panel ◽  
Hemodynamic Changes ◽  
Post Contrast ◽  
Ischemic Tissue ◽  
Parenchymal Blood Volume ◽  
The Right

In acute ischemic stroke, the ability to estimate the penumbra and infarction core ratio helps to triage those who will potentially benefit from thrombolytic therapies. Flat-panel post-contrast DynaCT imaging can provide both vasculature and parenchymal blood volume within the angio room to monitor hemodynamic changes during the endovascular procedures. We report on an 80-year-old woman who suffered from an acute occlusion of the right distal cervical internal carotid artery. She was transferred to the angio room where in-room post-contrast flat-panel DynaCT imaging (syngo Neuro PBV IR) was performed to access the ischemic tissue, followed by successful mechanical thrombolytic therapy.

Impact of digital imaging on radiation doses to the patient during X-ray examination of the urinary tract

2005 ◽  
Vol 46 (6) ◽  
pp. 657-661 ◽  
Author(s):  
B. Sjöholm ◽  
H. Geijer ◽  
J. Persliden
Keyword(s):  
Dose Reduction ◽  
Intravenous Urography ◽  
Radiation Doses ◽  
Flat Panel ◽  
Storage Phosphor ◽  
X Ray ◽  
Dose Area Product ◽  
Flat Panel Detector ◽  
Before And After ◽  
Phosphor Plates

Purpose: To compare radiation doses given to patients undergoing IVU (intravenous urography) before and after digitalization of our X-ray department. Material and Methods: IVU examinations were monitored with dose area product meters before and after the X-ray department changed to digital techniques. The first step was a change from film-screen to storage phosphor plates, while the second step involved changing to a flat panel detector. Forty-two patients were included for the film-screen situation, 69 when using the storage phosphor plates, and 70 using the flat panel detector. Results: A dose reduction from 41.8 Gycm2 to 31.5 Gycm2 was achieved with the first step when the film-screen system was replaced with storage phosphor plates. A further reduction to 12.1 Gycm2 was achieved using the flat panel detector. Conclusion: The introduction of the flat panel detectors made a considerable dose reduction possible.

scholarly journals Flat Panel Computed Tomography Pooled Blood Volume and Infarct Prediction in Endovascular Stroke Treatment

Stroke ◽  
2019 ◽  
Vol 50 (11) ◽  
pp. 3274-3276 ◽  
Author(s):  
Aneka Mueller ◽  
Marlies Wagner ◽  
Elke Hattingen ◽  
Alexander Seiler ◽  
Se-Jong You ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Endovascular Treatment ◽  
Blood Volume ◽  
Cerebral Artery ◽  
Clinical Decision Making ◽  
Infarct Volume ◽  
Multislice Ct ◽  
Flat Panel ◽  
Flat Panel Detector ◽  
Angiography Suite

Background and Purpose— Patients with large-vessel stroke frequently need to be transferred to comprehensive stroke centers for endovascular treatment. An update of physiological perfusion parameters and stroke progression on arrival is desirable. We examined the reliability of preinterventional pooled blood volume (PBV)-maps acquired by flat-panel detector computed tomography (CT) in the interventional angiography suite. Methods— The volumes of preinterventional perfusion deficit in flat-panel detector CT-PBV source images were compared with final infarct volume on follow-up multislice-CT after endovascular treatment of 29 consecutive patients with occlusion of the middle cerebral artery (MCA) or the distal internal carotid artery (ICA). Results— Endovascular treatment was successful in 26 patients (Thrombolysis in Cerebral Infarction, 2b-3). Overall, the median preinterventional PBV-deficit was 9×larger than median final infarct volume on multislice-CT (86.4 mL [10.3; 111.6] versus 9.6 mL [3.6; 36.8]). This was especially evident in the subgroup of successful recanalization (PBV-deficit: 87.5 mL [10.6; 115.1], final infarct: 8.7 mL [3.6; 29]). In futile recanalization, the final infarct tended to be underestimated (PBV-deficit: 86.4 mL [5.9; –] and final infarct: 116.4 mL [3.5; –]). Conclusions— Flat panel detector CT-PBV is not reliable in predicting the final infarct volume and should not be used in clinical decision making for endovascular treatment of acute cerebral artery occlusions.

scholarly journals Evaluation of the aortic arch injection method using 50% diluted-contrast medium for the measurement of cerebral blood volume with an angiographic C-arm system

2013 ◽  
Vol 7 (3) ◽  
pp. 145-155 ◽  
Author(s):  
Hiroshi ITOKAWA ◽  
Masao MORIYA ◽  
Michio FUJIMOTO ◽  
Yoshiyuki TOMITA ◽  
Noriyoshi OKAMOTO ◽  
...  
Keyword(s):  
Contrast Medium ◽  
Aortic Arch ◽  
Blood Volume ◽  
Cerebral Blood Volume ◽  
Injection Method
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