CT-like Imaging Development.pdf

The BRANSIST safire VC17 angiography system has been developed with a CT-like imaging function, allowing for cross-sectional images similar to those obtained with CT. The main aim of CT-like imaging is to increase safety and improve therapeutic efficacy during IVR treatment by obtaining 3D information without moving the patient.

Key Applications:

1. Identification of feeding vessels and determination of chemotherapy drug amounts.
2. Evaluation of efficacy and checking for bleeding after IVR treatment.

Comparison with CT:

CT-like imaging is inferior to CT in terms of low-contrast resolution due to limited data bit length and number of exposures. However, it offers superior high-contrast resolution (spatial resolution) and can create isotropic 3D images with a high level of spatial resolution.

System Specifications:

X-ray detector: 17-inch FPD
Rotation mechanism: C-arm
Rotational imaging range: 225º (continuous rotation not supported)
Exposure time: 10 or 20 s
Number of exposures: approximately 300 or 600
Data bit length: 14 bits
Low-contrast resolution: approximately 10 HU/10 mm
High-contrast resolution: 0.45 mm min. (isotropic)
* Exposure dose: approximately 1/5 to 1/2 of CT dose

Imaging Data Processing:

The system converts rotational images to CT-like images in three stages: conversion to X-ray absorption coefficients, reconstruction preprocessing, and reconstruction processing using the FBP (filtered back projection) method.

System Configuration:

The BRANSIST safire VC17 angiography system is equipped with a CT-like imaging function, including a 3D-angiography function, as an option. The image processing workstation is connected to the imaging system via high-speed LAN, allowing for reconstructed images to be displayed.