Key result
Spot ROI filtering linked to ~68% lower patient radiation dose versus conventional collimation.
Why the study?
The study aimed to evaluate the effectiveness and safety of a new filtering feature (Spot ROI) in reducing radiation exposure during RFCA for AF.
Does the Spot ROI filtering function reduce radiation exposure in patients undergoing radiofrequency catheter ablation for atrial fibrillation?
Cohort (n=69)
No
Does the Spot ROI filtering function reduce radiation exposure in patients undergoing radiofrequency catheter ablation for atrial fibrillation?
Effect estimate: 68.0% reduction
Absolute Event Rate: 5.6% vs 17.5%
p-value: p=<0.001
The Spot ROI filtering function significantly reduces radiation exposure for both patients and operators during atrial fibrillation ablation without compromising procedural success or safety.
May support lower radiation exposure in AF ablation; leaves open need for randomized confirmation before practice change.
Background: We aimed to assess the effectiveness and safety of a new filtering feature (Spot ROI TM , Canon Medical Systems, Japan) in reducing radiation exposure during radiofrequency catheter ablation (RFCA) for atrial fibrillation (AF). Methods and Results: The study involved 2 steps: (1) an ex vivo experiment to evaluate the radiation reduction of Spot ROI TM (SROI); (2) a clinical study with 69 consecutive patients undergoing initial AF-RFCA, divided into conventional collimation (CC) and SROI groups. All procedures used 3-dimensional electroanatomical mapping guidance. In the ex vivo model, SROI reduced radiation exposure by 66.7%. Clinically, all predefined procedures were successful, with similar complication rates between groups (CC vs. SROI, 3.2% vs. 2.6%; P=0.88). The dose–area product for patients (CC vs. SROI: 17.5 [12.8–25.4] vs. 5.6 [3.6–9.8] Gy · cm 2 , P<0.001) and scattered radiation at the operator’s chest level (13.0 [10.3–18.5] vs. 3.0 [1.8–5.3] µSv, P<0.001) were significantly lower with SROI. Procedural time (150 [125–167] vs. 150 [120–183] min, P=0.89), fluoroscopy time (13.6 [10.7–18.9] vs. 12.6 [9.6–15.2] min, P=0.09), and short- to intermediate-term recurrence rates were comparable between groups. Conclusions: SROI reduced the radiation exposure of both patients and operators without compromising procedural success, complication rates or recurrence rates.
No takes yet. Share an insight, caveat, or question.
Suzuki et al. (2026) conducted a cohort in Atrial fibrillation (n=69). Spot ROI (SROI) filtering function vs. Conventional collimation (CC) was evaluated on Dose-area product (DAP) for patients (68.0% reduction, p=<0.001). The Spot ROI filtering function significantly reduced patient radiation exposure (dose-area product) by a median of 68.0% compared to conventional collimation, without compromising procedural success.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: