A brief history
Four decades of seeing to treat
Minimally invasive, image-guided therapy didn't arrive as a single invention. It accumulated — one imaging breakthrough and one steerable instrument at a time — across four decades. What began with radiologists threading catheters under fluoroscopy and reading cross-sectional film on a lightbox has become a discipline where the scanner doesn't just show clinicians where to go, but guides the instrument there in real time. Eleven milestones below trace how the operating room's work moved into the scanner room.
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1980
Interventional radiology becomes a discipline
Following Andreas Grüntzig's 1977 balloon angioplasty, physicians begin routinely reaching organs through the skin instead of open surgery — draining abscesses, biopsying tumours and dilating vessels under fluoroscopy, ultrasound and the still-new CT scanner.
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1988
TIPS: a vascular bypass built from the inside
In Freiburg, Rösch, Richter and Rössle perform the first clinical transjugular intrahepatic portosystemic shunt, threading a stent through the liver's own vasculature to relieve portal hypertension — no incision beyond the neck.
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1992
Radiofrequency ablation treats tumours through a needle
A single electrode, guided by ultrasound or CT, heats a liver tumour from the inside until it dies — the organ, and the patient, never open up at all.
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1992
dedicated interventional MRI unit
Grönemeyer started in Mülheim, Germany, and now in Bochum, with a dedicated interventional permanent-magnet MRI — an early example of a scanner purpose-built for image-guided procedures rather than adapted from a diagnostic one.
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1994
MRI moves into the operating room
Brigham and Women's Hospital brings its “double-donut” magnet online, letting a surgeon stand inside the bore and watch live MR images while operating — the first real fusion of the scanner and the procedure.
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2000
Robotics enters the room
FDA clearance of the da Vinci Surgical System marks a turning point: from here, precision increasingly comes from a machine's wrist as much as a clinician's hand.
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2004
A therapy with no incision at all
MRI-guided focused ultrasound, approved for uterine fibroids as the ExAblate system, delivers therapeutic energy through intact skin — the scanner doesn't just find the target, it treats it.
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2011
Ablation without heat
Irreversible electroporation (NanoKnife) reaches tumours seated against vessels and nerves that thermal ablation couldn't safely touch, using electrical pulses in place of heat.
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2019
Robotic bronchoscopy reaches the lung's edge
Platforms such as Monarch and Ion steer a catheter through the airway's smallest branches, putting biopsy tools on nodules that were previously too peripheral to reach.
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2018–22
Radiotherapy learns to see in real time
MR-linac systems fuse live MRI with the radiation beam itself, adjusting to soft-tissue movement mid-treatment instead of planning around it in advance.
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Present
Convergence
AI-assisted planning, fusion imaging and robotic navigation are merging across CT- and MRI-guided procedures — the scanner room keeps taking on work that used to require an operating one.
Milestones summarised for illustration — this is a non-complete listing!