Hatching lines scanning patterns are an automated method for surface ablation that utilize parallel scanning trajectories to cover a target area. By implementing this technique, operators achieve highly uniform tissue removal across large surfaces, a result that is difficult to replicate with manual or irregular scanning methods. This approach fundamentally transforms ablation from a series of disjointed spots into a cohesive, controllable surface treatment.
By finely adjusting the distance between parallel lines, hatching patterns allow for precise regulation of energy overlap. This capability is essential for defining the final surface morphology, ensuring both strict depth control and optimal smoothness.
Achieving Uniformity and Coverage
Automated Area Coverage
Hatching lines allow an automated system to systematically cover a target evaporation area. Rather than relying on operator dexterity, the system executes pre-calculated parallel trajectories. This ensures that even extensive surface lesions or treatment zones are addressed without missed spots.
Consistent Tissue Removal
Because the scanning trajectories are parallel and machine-controlled, the tissue removal is exceptionally consistent. This technique minimizes the irregularities often associated with freehand ablation. The result is a uniform ablation zone where the tissue is vaporized evenly across the entire defined geometry.
Precision Control of Tissue Morphology
Managing Energy Overlap
The defining feature of this method is the ability to adjust the interval between lines, such as setting a specific 150µm distance. This adjustment dictates the degree of energy overlap between adjacent passes. By tightening or widening this gap, you directly influence how much thermal energy is deposited at the boundaries of the scan lines.
Defining Surface Smoothness
Control over the line interval allows operators to determine the texture of the treated tissue. High overlap tends to "polish" the surface, resulting in greater surface smoothness. This is critical when the aesthetic or functional finish of the biological tissue is a priority.
Strict Depth Regulation
Uniform overlap leads to predictable ablation rates. This allows for strict control over ablation depth, preventing accidental over-treatment in sensitive biological structures. The hatching pattern ensures that the depth of removal is constant throughout the entire scanned field.
Understanding the Trade-offs
The Interval Sensitivity
While adjustable intervals offer control, they also introduce a critical variable. If the distance between hatching lines is set too narrow, the energy overlap may become excessive. This can lead to unwanted thermal accumulation or deep tissue damage despite a smooth surface finish.
Morphology vs. Speed
Conversely, widening the interval to cover areas faster or reduce heat reduces the overlap. This often compromises the surface morphology, potentially leaving ridges or a "washboard" texture on the tissue surface. Operators must balance the need for smoothness against the thermal tolerance of the specific tissue type.
Making the Right Choice for Your Goal
To leverage hatching lines effectively, you must calibrate the line interval based on the desired clinical outcome.
- If your primary focus is superior surface smoothness: Decrease the distance between hatching lines to maximize energy overlap, ensuring a polished and uniform topography.
- If your primary focus is depth precision over large areas: Maintain a consistent, moderate interval to ensure uniform removal rates without creating hot spots.
Mastering the balance of line spacing is the key to transforming raw ablation capability into a precise, predictable surgical outcome.
Summary Table:
| Feature | Advantage of Hatching Line Patterns | Impact on Clinical Outcome |
|---|---|---|
| Scanning Trajectory | Automated parallel lines | Eliminates missed spots and manual irregularity |
| Energy Overlap | Adjustable line intervals (e.g., 150µm) | Enables precise control over surface smoothness |
| Ablation Depth | Consistent removal rates | Prevents over-treatment and ensures depth safety |
| Tissue Morphology | Controllable surface texture | Delivers a polished finish or defined topography |
| Process Efficiency | Automated area coverage | Uniform vaporization across large treatment zones |
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References
- А. К. Дмитриев, Valery A. Ul'yanov. Prediction of Automated Evaporation of Soft Biotissues of Different Types by Continuous CO2 Laser Radiation. DOI: 10.18287/jbpe25.11.030302
This article is also based on technical information from Belislaser Knowledge Base .
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