OP0102 Prolonged image acquisition time after contrast agent administration results in increased synovial thickness on post-contrast mri of jia patients: standardisation is key

Object Efficacy of radiosurgery in vestibular schwannoma (VS) is usually documented by changes of tumor size and by loss of contrast enhancement in MR imaging within the central portion of the lesion. Until now, however, correlation between contrast enhancement and timing of image acquisition in nontreated VS has not been analyzed systematically. The authors undertook this study to investigate changes in contrast enhancement with respect to latency of image acquisition after contrast agent administration. Methods The dynamics of contrast medium uptake were evaluated with T1-weighted VIBE MR imaging sequences performed immediately and 1.5, 3.5, 4.5, 9.5, and 11.5 minutes after administration of single dose of Gd in 21 patients with nontreated medium- to large-sized VSs. Signal-to-noise (SNR) and contrast-to-noise ratio (CNR) of tumors were evaluated, and volumes of central nonenhancing areas (NEAs) were determined. Results The interior appearance of the tumors changed considerably over time. The NEA significantly diminished in size (p < 0.0001, Friedman test) and almost completely disappeared in all but 2 patients. Compared to images at 1.5 minutes, NEA volumes decreased to a median of 36% at 3.5 minutes and 34% at 4.5 minutes, showing smaller changes after that—9% at 9.5 minutes and 3% at 11.5 minutes. Tumor SNR and CNR increased over time. The maximum change in the median values for SNR and CNR were a 72% increase and 117% increase, respectively; both occurred at 1.5 minutes after Gd administration. Conclusions Contrast enhancement in VS MR imaging varies according to the duration of the delay between contrast agent administration and image acquisition. Postradiotherapy changes in contrast enhancement of VS can therefore not be attributed only to effective radiotherapy. So-called “loss of central contrast enhancement” may be falsely detected because of timing. A standardized protocol with defined timing of image acquisition may increase comparability of contrast uptake in VS.

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Light efficiency vs. image acquisition time: considerations for parallel confocal microscopy applied to biological tissue observation

Optics Communications ◽

10.1016/s0030-4018(01)01327-x ◽

2001 ◽

Vol 195 (5-6) ◽

pp. 361-369 ◽

Cited By ~ 1

Author(s):

F. Vuille ◽

R. Lehmann ◽

K. Plamann

Keyword(s):

Confocal Microscopy ◽

Biological Tissue ◽

Image Acquisition ◽

Acquisition Time ◽

Image Acquisition Time ◽

Light Efficiency

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Respiratory triggered diffusion-weighted imaging with a single diffusion sensitising gradient to reduce image acquisition time –a feasibility study in the workup of hepatocellular carcinoma

European Journal of Radiology ◽

10.1016/j.ejrad.2021.109807 ◽

2021 ◽

pp. 109807

Author(s):

Adarsh Ghosh ◽

Richa Yadav ◽

Shalimar ◽

Shivanand Gamanagatti

Keyword(s):

Hepatocellular Carcinoma ◽

Feasibility Study ◽

Diffusion Weighted Imaging ◽

Image Acquisition ◽

Acquisition Time ◽

Diffusion Weighted ◽

Image Acquisition Time

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Image Acquisition Time Series Prediction Method Based on Deep Learning

Journal of Physics Conference Series ◽

10.1088/1742-6596/1848/1/012080 ◽

2021 ◽

Vol 1848 (1) ◽

pp. 012080

Author(s):

Zhisong Mo ◽

Yifei Li

Keyword(s):

Time Series ◽

Deep Learning ◽

Image Acquisition ◽

Time Series Prediction ◽

Prediction Method ◽

Acquisition Time ◽

Image Acquisition Time

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Intraoperative Cerebral Angiography by Intravenous Contrast Administration With 3-Dimensional Rotational Fluoroscopy in Patients With Intracranial Aneurysms

Operative Neurosurgery ◽

10.1227/neu.0000000000000648 ◽

2015 ◽

Vol 11 (1) ◽

pp. 119-126

Author(s):

Thomas Westermaier ◽

Thomas Linsenmann ◽

Almuth F Keßler ◽

Christian Stetter ◽

Nadine Willner ◽

...

Keyword(s):

Image Quality ◽

Contrast Agent ◽

Intracranial Aneurysms ◽

Intraoperative Imaging ◽

Image Acquisition ◽

Acquisition Time ◽

Contrast Administration ◽

Intravenous Contrast ◽

Large Space ◽

3 Dimensional

Abstract BACKGROUND Intraoperative imaging of cerebral aneurysms may be desirable in emergency situations with large space-occupying hematomas or to visualize vessels after clip placement. Mobile 3-dimensional fluoroscopes are available in a number of neurosurgical departments and may be useful in combination with simple image postprocessing to depict cerebral vessels. OBJECTIVE To assess whether intracranial aneurysms are detectable with appropriate image quality with intraoperative 3-dimensional fluoroscopy with intravenous contrast administration. METHODS Eight patients were included in the study. The patients' heads were fixed in a radiolucent Mayfield clamp. First, a rotational fluoroscopy scan was performed without contrast agent. Then, a second scan with 50 mL iodine contrast agent was performed. The DICOM (digital imaging and communications in medicine) data of both scans were transferred to an Apple PowerMac workstation, subtracted, and reconstructed with OsiriX imaging software. The images were compared with preoperative angiograms. RESULTS No adverse effects were observed during contrast administration. The entire procedure from fluoroscope positioning to the production of usable 3-dimensional images took 5 to 6 minutes with an image acquisition time of 2 × 24 seconds. The configuration of the aneurysm and the vessel anatomy were assessable. Previous coiling limited image quality in 1 patient. CONCLUSION This technique quickly provides images of adequate quality to assess the configuration of intracranial aneurysms, which may be helpful when immediate intraoperative information about intracranial vessel pathologies is required. The positioning of the fluoroscope, image acquisition, and processing can be completely integrated into the surgical workflow.

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