Survey of CT radiation doses and iodinated contrast medium administration: an international multicentric study

Karout, Lina;null, null;Kaviani, Parisa;Dasegowda, Giridhar;Garza-Frias, Emiliano;Fahimi, Roshan;Rawashdeh, Mohammad;Saade, Charbel;Digumarthy, Subba R.;Abi-Ghanem, Alain S.;Hosseini, Seyedehelaheh;Saba, Luca;Ebrahimian, Shadi;Vora, Tanisha Pragnesh;El Mais, Huda;Jabbour, Yara;Aly, Antar;Naffaa, Lena;Kassab, Mohamad B.;Nassar, Mahmoud;Bernardo, Monica;Oyetayo, Boluwatife Taiwo;Yaseen, Abdel-Baset Bani;Owda, Zaina Mohammad;Gabutti, Jesus Alejandro;Musa, Keffi Mubarak;Shrestha, Ramesh;Al Qudah, Heba Raid Hussein;Ilaghi, Mehran;Esfahani, Mahsa Masjedi;Ghonim, Mohanad Ahmed;Hailat, Mohammad Zeyad;Ibrahim, Mohamed K.;Anand, Roshni;Rackimuthu, Sudhan;Shrivastava, Aayush;Shapouran, Arastou;Shafieyoon, Shamim;Chamma, Linda;Awas, Ali Ahmed;Panchal, Viraj Shirish;Parikh, Vidhi Rajat;Teixeira, Bernardo Corrêa de Almeida;Amleshi, Reza Saboori;Safarini, Omar A.;Lucena, Ronaldo Albé;de Castro, Davi Fernandes;AL-Jarrah, Mooath Omar;Shahidi, Ramin;Khazaei, Mehdi;Kotian, Rahul Pratap;Kotian, Disha R.;AlShunaigat, Nadeem Abdul Naser;Alkuwari, Maryam A. Aziz;Alkhulaifat, Dana;Kilinçer, Abidin;Thawabah, Abdalaziz Fahd;Chowdhary, Anisa;Goedert, Gianne M.;Abs, Leila;Gallegos, Francisco Edgardo Puente;Nassar, Nabil;Segota, Doris;Rizzo, Vincent;Jabi, Mira Nabil Al;Cau, Riccardo;Gampala, Sravani;Arvind, Shreya;Pinheiro, Antônio Márcio Alves;Mokrian, Hermin;Sabry, Kareem Ahmed Abdelaziz;Abu Zaineh, Ala'a;Chaaban, Ali Khaled;Nasr, Anthony Maroun;Marciano, Larissa;Kiipper, Felipe Moura;Real, Jessica Villa;Negreros-Osuna, Adrián Antonio;Huerta-Sanchez, Monica Catalina;Mora, Juan Alberto Garay;Yohannan, Susan;Christie, Omari;Ghonim, Mohamed Ahmed;Safavi-Naini, Seyed Amir Ahmad;Deshmukh, Ashwin;Maliyekkal, Shafeeque T.;Agrawal, Vibhor;Kumar, Manoj;Tarawneh, Leen;Panchal, Kanan;Richie, Anto J.;Vaidya, Vijay Narsidas;Taiye, Adesina Mubarak;Koolivand, Sohrab;Shayganfar, Azin;Talari, Hamidreza;Moscatelli, Antonio;Gershan, Vesna;Kalra, Mannudeep K.

2024-01-01

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Abstract

ObjectiveTo assess the relationship between intravenous iodinated contrast media (ICM) administration usage and radiation doses for contrast-enhanced (CE) CT of head, chest, and abdomen-pelvis (AP) in international, multicenter settings. MethodsOur international (n = 16 countries), multicenter (n = 43 sites), and cross-sectional (ConRad) study had two parts. Part 1: Redcap survey with questions on information related to CT and ICM manufacturer/brand and respective protocols. Part 2: Information on 3,258 patients (18-96 years; M:F 1654:1604) who underwent CECT for a routine head (n = 456), chest (n = 528), AP (n = 599), head CT angiography (n = 539), pulmonary embolism (n = 599), and liver CT examinations (n = 537) at 43 sites across five continents. The following information was recorded: hospital name, patient age, gender, body mass index [BMI], clinical indications, scan parameters (number of scan phases, kV), IV-contrast information (concentration, volume, flow rate, and delay), and dose indices (CTDIvol and DLP). ResultsMost routine chest (58.4%) and AP (68.7%) CECT exams were performed with 2-4 scan phases with fixed scan delay (chest 71.4%; AP 79.8%, liver CECT 50.7%) following ICM administration. Most sites did not change kV across different patients and scan phases; most CECT protocols were performed at 120-140 kV (83%, 1979/2685). There were no significant differences between radiation doses for non-contrast (CTDIvol 24 [16-30] mGy; DLP 633 [414-702] mGycm) and post-contrast phases (22 [19-27] mGy; 648 [392-694] mGycm) (p = 0.142). Sites that used bolus tracking for chest and AP CECT had lower CTDIvol than sites with fixed scan delays (p < 0.001). There was no correlation between BMI and CTDIvol (r2 <= - 0.1 to 0.1, p = 0.931). ConclusionOur study demonstrates up to ten-fold variability in ICM injection protocols and radiation doses across different CT protocols. The study emphasizes the need for optimizing CT scanning and contrast protocols to reduce unnecessary contrast and radiation exposure to patients. Clinical relevance statementThe wide variability and lack of standardization of ICM media and radiation doses in CT protocols suggest the need for education and optimization of contrast usage and scan factors for optimizing image quality in CECT.