Related Experiment Videos
Dose reduction fluoroscopy in pediatrics
Henrique M Lederman1, Zarir P Khademian, Marc Felice
1Department of Radiology, University of Pennsylvania Medical School, Philadelphia, Pennsylvania, USA.
Insights
Reducing radiation exposure in pediatric imaging is crucial. Using 3.75 pulses per second (pps) with digitized imaging significantly lowers radiation dose by 87% with minimal impact on image resolution.
Area of Science:
- Medical Imaging Physics
- Pediatric Radiology
Background:
- Minimizing radiation exposure in pediatric patients is a critical concern in medical imaging.
- Maintaining diagnostic image quality is essential while reducing radiation dose.
Purpose of the Study:
- To compare radiation dose, image quality, and spatial resolution between continuous and pulsed fluoroscopy techniques.
- To evaluate film-screen versus digitized spot imaging (fluoro grab image) for procedures like voiding cystourethrogram (VCUG).
Main Methods:
- A Plexiglas phantom was used to measure dosimetry (mGy), spatial resolution (lp/mm), and threshold contrast resolution.
- Radiation doses were assessed for continuous and pulsed (15, 7.5, 3.75 pps) fluoroscopy at full and half doses.
- Image acquisition parameters included normal, magnification 1, and magnification 2 factors.
Main Results:
- Continuous full-dose fluoroscopy (3 min, 10 photo spots) resulted in 28.7 mGy dose, 2 lp/mm resolution, and 2.2% contrast threshold.
- Half-dose, 3.75 pps pulsed fluoroscopy (3 min, grab images) yielded 3.7 mGy dose, 1.9 lp/mm resolution, and 2.3% contrast threshold.
Conclusions:
- Utilizing 3.75 pulses per second (pps) with digitized imaging achieves an 87% reduction in radiation dose.
- This significant dose reduction is accomplished with only a minimal compromise in image resolution, making it a viable option for pediatric procedures.
Background:
It is essential that we find ways to reduce radiation exposure to children and maintain image quality.
Objectives:
We compared radiation dose, image quality, and spatial resolution when continuous and pulse fluoroscopy with a full and half dose are applied to a phantom. The film-screen technique was compared to fluoroscopy with the digitized spot technique (fluoro grab image) in procedures such as voiding cystourethrogram (VCUG).
Materials And Methods:
Using a 15.1-cm Plexiglas phantom, we obtained dosimetry in milligrays (mGy), spatial resolution in number of line pairs per millimeter (lp/mm), and threshold contrast resolution in number of visible holes. To measure total radiation dose, we calculated the average elapsed fluoroscopy time for VCUG to be approximately 3 min and estimated the average number of exposures as 10. Dosimetry was obtained for full dose and half dose continuous, for 15 pulses per second (pps), 7.5 pps, and 3.75 pps. These were also calculated with normal, magnification 1, and magnification 2 factors.
Results:
Results of the two most relevant parameters are shown: continuous full-dose fluoroscopy, 3 min, 10 photo spots, total dose of 28.7 mGy with 2 lp/mm of resolution and a threshold contrast of 2.2%, versus 3.75 pps half-dose fluoroscopy, 3 min, grab images, total dose of 3.7 mGy with 1.9 lp/mm of resolution and a threshold contrast of 2.3%.
Conclusion:
With minimal loss of resolution there is significant dose reduction (87%) when using 3.75 pps with digitized imaging.