Cumulative radiation dose during iterative chest scans

Congress:

EuroSafe 2022

Poster Number:

ESI-14684

Type:

EuroSafe Imaging

Keywords:

Radioprotection / Radiation dose, Thorax, CT, CT-Angiography, CT-High Resolution, Diagnostic procedure, Radiation safety, Dosimetric comparison

Authors:

M. Affes, M. Attia, A. Gasmi, I. Baccouche, S. Kchaou, H. Neji, S. Hantous-Zannad

DOI:

DOI-Link:

https://dx.doi.org/

Purpose or learning objective

The aim of our work was to assess the cumulative irradiation dose during repetitive chest comupted tomography (CT) scans as part of check-ups for pulmonary or pleuroparietal diseases.

Methods or background

We conducted a retrospective study in the medical imaging department of Abderrahmen Mami Hospital in Ariana between March 2018 and March 2019. We have collected 36 patients who had been explored by iterative chest CT. We included adult patients over the age of 20 who have been explored by at least three chest CT in their history as part of the monitoring assessments.

Results or findings

The mean age of the patients was 53 years old. The sex ratio was 3.5 with 28 men and eight women. The main indications noted, for repetitive chest CT scans, were control of pulmonary nodules in 31% of patients, pneumothorax or pleural effusions in 17% of cases and monitoring of diffuse infiltrating pneumonia in 14% of cases (fig.2). [Fig 2] We collected a total of 155 CT scans with an average of four examinations per patient (fig.5). They were performed on a multislice CT scan...

Conclusion

The main limitation of our study was the lack of precision when calculating the cumulative dose since we had to estimate the effective dose in 25% of the CT scans. However, although our study is limited in number of patients, it made it possible to evaluate the cumulative dose received at the thoracic level after repetitive CT scans. This dose was variable depending on the number of scans performed, and the number of acquisitions per scan. Thus, this study illustrates the interest of systematically reporting...

References

1. Tsalafoutas IA, Hassan Kharita M, Al-Naemi H, Kalra MK. Radiation dosemonitoring in computed tomography: Status, options and limitations. Phys Med.2020. 79:1-15.2. Delchambre M. Calcul de la dose efficace cumulée reçue par nos patients entomodensitométrie diagnostique : création d’un outil informatique pour lemédecin généraliste [Thèse]. Médecine humaine et pathologie: Grenoble; 2012.87p.3. Boone JM, Hendee WR, McNitt-Gray MF, Seltzer SE. Radiation exposure from CTscans: how to close our knowledge gaps, monitor and safeguard exposureproceedingsand recommendations of the radiation dose summit. Radiology.2012;265(2):544-54.4. Ferretti G, Jankowski A. Radiation...

Personal information and conflict of interest

M. Affes: Nothing to disclose M. Attia: Nothing to disclose A. Gasmi: Nothing to disclose I. Baccouche: Nothing to disclose S. Kchaou: Nothing to disclose H. Neji: Nothing to disclose S. Hantous-Zannad: Nothing to disclose

Fig 1: Distribution of CT scans according to the type of machine used

Fig 2: Indications for CT exams

Fig 3: Distribution of CT exams according to the number of aquisitions made

Fig 4: Distribution of patients according to the cumulative dose on the thoracic level

Fig 5: Distribution of the number of CT exams per patient