The Effect of Increasing C-arm SID: Improving Image Resolution and Positioning Accuracy

The Effect of Increasing C-arm SID: Improving Image Resolution and Positioning Accuracy

SID is an important technical parameter in C-arm systems. It refers to the distance from the focal point (filament) of the X-ray tube to the image receptor, also known as source-to-image distance or focus-to-screen distance.

The adjustment of SID in C-arm equipment has various impacts on clinical operations and imaging results. Increasing the SID primarily affects the following three aspects:

Optimizing Image Resolution and Geometric Accuracy
Increasing the SID reduces the geometric magnification effect, minimizing edge blurring and distortion caused by excessive magnification. This improves both image resolution and positioning accuracy. This is especially important in surgeries requiring high-precision positioning, such as orthopedic 3D imaging and vascular interventions.

  1. Expanding the Surgical Workspace

By increasing the SID through adjusting the position of the flat-panel detector, the C-arm's opening space is also expanded, providing doctors with a larger operational area and reducing the risks of equipment collisions or patient infections. For example, in orthopedic reduction or complex interventional surgeries, a larger opening facilitates the entry and exit of instruments and flexible adjustment of the patient's position.

  1. Adapting to Diverse Clinical Needs

Different surgeries have varying SID requirements: a larger SID is suitable for precise operations that require high-resolution images (such as spinal fixation), while a smaller SID is used for broad and quick positioning (such as trauma emergency care). Some devices (like the Perlove PLX C7600 series) support dynamic SID adjustment, allowing for free control of the flat-panel detector's elevation, thereby adjusting the size of the C-arm opening and enabling flexible intraoperative switching. When the flat-panel detector is elevated, the C-arm opening distance increases, expanding the surgical space and facilitating positioning. When lowered, the detector can be brought closer to the patient, not only expanding the imaging field but also aiding in surgical localization.

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