Occupational Dose Estimation with Field Size, Position and C-Arm Gantry Tilt Variations During Interventional Cardiology Procedures

Nurdina Gita Pratiwi, Supriyanto Ardjo Pawiro, Kristina Tri Wigati, Djarwani S. Soejoko


In Interventional Cardiology, dose received by the patient is relatively higher, while the occupational would receive scattered radiation dose whose quality is relatively lower. However, the occupational received accumulative doses of all cardiovascular procedures were done over the years. Therefore, the purpose of this paper will focus to estimate the distribution of scattered dose to occupational without any protective shielding in the Cath Lab. The scattered dose rate was measured by using survey detector of Unfors Xi. The detector was placed at 6 different positions around the phantom. Each measurement position has eleven points from 25 to 175 cm above the floor with increment of 15 cm as the illustration of partial height of occupational organ. Experimentally a Rando phantom was irradiated by automatic pulsed fluoroscopy with condition varies in the range of 88-93 kV and 5.7-9.4 mA depend on gantry tilt and field size. The Philips C-arm gantry tilt was varied at 0o PA projection, 20o and 30o Caudal, 20o and 30o Cranial, and 40o and 50o Left Anterior Oblique, and also Flat Panel Detector (FPD) was varied at 20 x 20 and 25 x 25 cm2. Generally, the greatest dose rate was known at level corresponding to the waist (100 cm) of occupational and the lowest at head areas (175 cm) of occupational which is 2.49 mGv/h and 0.02 mGy/h, respectively. The given data showed that the scattered fractions are in the range of 0.001-0.060% from its primary dose at isocenter. The scattered doses tend to increase with gantry tilt for all positions. Increasing field size of FPD will decreased the scattered fraction from its dose at isocenter, and also it affects the scattered dose rate.

Full Text:



Cousins, C., & Sharp, C. (2004). Medical Interventional Procedures-Reducing The Radiation Risks. Clinical Radiology, 468-473.

AAPM report No. 70, Cardiac catheterization equipment performance, Medical Physics Publishing, 2001.

Bushberg, J. T., Seibert, J. A., Leidholdt, E. M., & Boone, J. M. (2002). The Essential Physics of Medical Imaging. Philadelphia: Lippincott Williams & Wilkins.

Davros, W. J. (2007). Fluoroscopy: basic science optimal use, and patient/operator protection. Techniques in Regional Anesthesia & Pain Management , 44-54.

Domienik, J., Brodecki, M., & Rusicka, D. (2012). A Study of Dose Distribution in The Region of The Eye Lens and Extremities for Occupational Working in Interventional Cardiology. Radiation Measurements , 130-138.

Janne, B., & Lin, P.-J. P. (2007). The Influence of Angiography Table Shields and Height on Patient and Angiographer Irradiation During Interventional Radiology Procedures. Cardiovasc Intervent Radiol , 448-454.

Schueler, B. A. (2010). Operator Shielding: How and Why. Techniques in Vascular and Interventional Radiology , 167-171.


  • There are currently no refbacks.

©2017 (onwards) Aliansi Fisikawan Medik Indonesia / Indonesian Association of Physicists in Medicine

Print ISSN: 2355-2727 | Online ISSN: 2355-2719