August 19, 2026
Modern neurosurgery increasingly relies on real-time imaging performed during the operation itself, rather than relying solely on images taken before surgery began. Two of the primary technologies used for this purpose are intraoperative CT and intraoperative MRI, each offering surgeons the ability to verify their progress and adjust their approach while a patient is still in the operating room.
Understanding the differences between these two technologies can help patients better appreciate the tools their surgical team may use during a procedure.
Both intraoperative CT and intraoperative MRI serve the same fundamental purpose: allowing the surgical team to obtain updated imaging of the surgical site without having to move the patient to a separate imaging suite and interrupt the procedure. This real-time feedback can confirm that a tumor has been fully removed, verify that spinal hardware has been placed correctly, or reveal any unexpected findings that require the surgeon to adjust their plan before closing.
Prior to the availability of these technologies, surgeons had to rely more heavily on pre-operative imaging and their own visual and tactile assessment during surgery, which made it harder to catch certain issues before the patient left the operating room.
Intraoperative CT typically involves a mobile CT scanner that can be brought directly into the operating room, allowing images to be captured while the patient remains on the operating table. CT is particularly valuable for visualizing bone and hardware, making it an excellent tool for confirming the placement of spinal screws, rods, and other instrumentation during spine surgery.
CT scans are also relatively quick to perform, which can help minimize the amount of additional time added to the procedure, an important consideration during longer or more complex surgeries.
Intraoperative MRI, often performed using a specially designed operating suite with an integrated MRI scanner, provides highly detailed images of soft tissue, making it particularly valuable during brain tumor surgery. Because MRI can distinguish tumor tissue from healthy brain tissue with much greater clarity than CT, it allows surgeons to more precisely assess how much of a tumor has been removed and whether any residual tissue remains that could be safely resected further.
This capability has made intraoperative MRI an important tool in efforts to maximize tumor removal while minimizing damage to critical brain structures.
The choice between intraoperative CT and intraoperative MRI generally depends on the type of surgery being performed and what the surgical team needs to visualize. CT’s speed and excellent bone detail make it well suited to spine surgery, where confirming hardware placement is often the primary concern. MRI’s superior soft tissue contrast makes it the preferred choice for many brain tumor surgeries, where distinguishing tumor from healthy tissue is the priority.
Some advanced surgical centers have access to both technologies and may even use them in combination depending on the specific demands of a case.
The use of intraoperative imaging can add time to a surgical procedure, since the imaging process itself, along with any necessary adjustments based on what is found, takes additional minutes to hours depending on the complexity of the case. Patients and families should understand that a longer time in the operating room does not necessarily indicate a problem; it may simply reflect the surgical team taking extra steps to verify a good outcome using these technologies.
Surgeons typically discuss whether intraoperative imaging will be used as part of the pre-operative planning conversation, so patients have an opportunity to ask questions about how it fits into their specific procedure.
Perhaps the most significant benefit of both intraoperative CT and intraoperative MRI is the ability to identify and address issues before a patient leaves the operating room, rather than discovering a problem on a post-operative scan and potentially requiring a return trip to surgery.
This real-time verification capability has become an increasingly important part of modern neurosurgical and spinal practice, reflecting a broader trend toward incorporating advanced imaging directly into the surgical workflow rather than treating it as a separate, pre- or post-operative step.
If you’re preparing for a neurosurgical procedure and want to understand which imaging technology your surgical team will use, we’re happy to explain. Call (866) 467-1770 to ask our team, or Request a Consultation Online to schedule a visit.