How Can 3D Preoperative Simulation Help Reduce Time in the Operating Room?

3D preoperative simulation is, at its core, a way of shifting work from the operating room to the planning phase that precedes it. And that earlier phase is precisely where the amount of time the surgery will later require gets decided. Operating room time is one of the most expensive and most contested resources in any hospital: every minute a team spends reorienting itself on a patient’s anatomy, confirming exactly where a vessel, a nerve, or the edge of a lesion is located, is a minute not spent operating, and one that also prolongs the patient’s exposure to anesthesia. That’s why it’s worth understanding exactly why 3D preoperative simulation can help shorten that time.

Where Time Is Lost Before Surgery Begins

A significant portion of surgical time isn’t spent operating, but deciding on the fly. Working with two-dimensional CT or MRI images, the surgeon must mentally reconstruct, slice by slice, the three-dimensional arrangement of structures: where each vessel runs, how a tumor relates to the healthy tissue around it, where it’s best to enter, and which areas should be avoided. That mental reconstruction works well in routine cases, but it slows down considerably as the anatomy becomes more atypical or as the lesion sits closer to critical structures.

That’s where uncertainties accumulate, uncertainties that, once in the operating room, translate into pauses to re-check the imaging, additional verifications before taking an irreversible step, or changes in strategy made in real time. None of these pauses shows up as a single major delay; instead, they’re scattered across small moments throughout the entire procedure, and it’s that accumulation that ultimately extends total time in the operating room.

The Mechanism: Deciding Beforehand, Not Reorienting During Surgery

3D preoperative simulation acts precisely on that earlier phase. Using the same DICOM data from the patient’s CT or MRI scan, a three-dimensional model is generated that can be explored before the procedure: rotated, broken down into individual structures, and used to mentally rehearse the surgical approach. LAIA XR, the medical visualization platform developed by ARSOFT, is built on this principle: it converts the patient’s DICOM study into a navigable model that can be reviewed on screen, in augmented reality, or through a virtual reality headset, before the team ever enters the operating room.

The reasoning is straightforward: if most anatomical uncertainties are resolved before surgery, the team arrives with an already-validated strategy and needs less time to reorient itself during the procedure itself. When the surgeon has already identified, reviewed, and discussed with the team exactly where each at-risk structure lies, the surgery becomes the execution of a plan rather than the construction of that plan in real time. It’s the difference between arriving in the operating room with questions still to answer versus arriving with answers already worked out.

Fewer stops, less improvisation thanks to 3D preoperative simulation

That time savings doesn’t show up at a single moment in the surgery; instead, it’s distributed across several points in the process:

• Fewer imaging consultations during the procedure: If the team has already reviewed the 3D model beforehand, there’s less need to pause and re-check the CT or MRI mid-surgery, a step that in complex cases can be repeated several times.
• Fewer on-the-fly changes in strategy: Part of the time lost in complex surgeries comes from having to rethink the approach after finding a structure in an unexpected position; rehearsing the case beforehand helps anticipate those surprises and arrive with a backup plan already thought through, rather than improvised.
• More agile team coordination: When the entire surgical team, lead surgeon, assistants, and nursing staff, has seen and discussed the same model before operating, instructions during the procedure become more direct, since there’s no need to describe the anatomy from scratch at every step.
• More precise preparation of necessary equipment: Knowing in advance the exact arrangement of structures makes it easier to anticipate what instruments or support the team will actually need, without relying on last-minute decisions.

Where This Benefit Has the Most Impact

The pattern is clear: the benefit is greater the more complex or atypical the patient’s anatomy. In lesions located near vascular or nervous structures, in tumors with unusual anatomical relationships, or in congenital malformations, having a navigable model available before surgery reduces the uncertainty that would otherwise need to be resolved with more time and more caution during the procedure itself. In routine interventions with predictable anatomy, the potential improvement in surgical time is, naturally, smaller: this tool delivers its greatest value precisely when a case falls outside the norm, which is also when minutes matter most.

This has a practical implication for any surgical department considering adopting this technology: it shouldn’t be thought of as a tool that saves the same amount of time in every surgery, but rather as a resource that pays off especially in cases where the patient’s anatomy demands more caution than usual.

3D preoperative simulation as a tool that complements the surgeon’s judgment

3D preoperative simulation doesn’t replace the judgment or experience of the surgical team; it gives them, before they ever step into the operating room, the same spatial understanding that until now could only be gained through the surgery itself. Moving that phase of orientation to an earlier point, when there’s still room to review, discuss, and decide calmly, is what allows time in the operating room to be devoted almost entirely to operating. And that shift, however small it may seem case by case, is what ultimately makes the difference in the cases where it’s needed most.