# Analyzing the SAR in Human Head Tissues under Different Exposure Scenarios
### Research Gaps of Previous Work on SAR  
SAR studies have often utilized simplified human models, which may not adequately account for the potential variability of SAR, including age groups, genders, and anatomical variations, across different demographics. Further research is necessary to investigate these variabilities and their implications for SAR assessment. Additionally, there is a need to explore the variations in SAR among specific population groups, such as babies, children, and women, to ensure that safety guidelines are appropriately tailored to protect these vulnerable groups. This study can contribute significantly to a more comprehensive \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Ref.** & **Human Model** & **Parts/Organs/Tissues** & **Frequency (MHz)** & **Key Highlights** \\ \hline
[9] & Adult & Head & 900 &
\begin{tabular}{c} SAR and radiation source distance \\ relation \\ \end{tabular} \\ \hline
[10] & Child & Head & 900 &
\begin{tabular}{c} Relation between SAR and distance from \\ the source of radiation \\ \end{tabular} \\ \hline
[11] & Adult, child & Head/eye & 900, 1800 & Head size and SAR relation \\ \hline
[12] & Adult (male), child (boy, girl) & Head/brain/eye & 900, 1800 &
\begin{tabular}{c} Age dependent-tissue specific exposure \\ differences \\ \end{tabular} \\ \hline
[13] & Adult (male, female), child & Head/brain & 900, 1800, 2100, 2400 &
\begin{tabular}{c} Comparisons between adults’ and \\ children’s SAR distributions \\ \end{tabular} \\ \hline
[14] & Adult, child & Head/fat/skin/bone/ & 900 &
\begin{tabular}{c} Effect of overexposure as well as age and \\ radiated power on the SAR \\ \end{tabular} \\ \hline
[15] & Adult, child & Head/whole body & 800, 900, 1800, 2100 &
\begin{tabular}{c} Modeling daily RF dose in brain regions \\ and the whole body in children and \\ adolescents \\ \end{tabular} \\ \hline
[16] & Adult, child & Head & 900, 1747, 1950 &
\begin{tabular}{c} Investigates the SAR difference in the \\ heads of children and adults using \\ realistic EMF sources \\ \end{tabular} \\ \hline
[17] & Adult, child & \
\begin{tabular}{c} Whole \\ body/head/torso \\ \end{tabular} & 20 to 2400 &
\begin{tabular}{c} Variability analysis of SAR for different \\ body models used in numerical dosimetry \\ studies \\ \end{tabular} \\ \hline
[18] & Adult & Head & 900, 1800 & SAR evaluation in case of overexposure \\ \hline
[19] & \begin{tabular}{c} \begin{tabular}{c} \begin{tabular}{c} \begin{tabular}{c} \begin{tabular}{c} \begin{tabular}{c} \begin{tabular}{c} \begin{tabular}{c} \
\begin{tabular}{c}
\begin{tabular}{c} \end{tabular} \\ \end{tabular} \\ \end{tabular} \\ \end{tabular} \\ \end{tabular} \\ \end{tabular} \\ \hline
[20] & Adult, child & Whole body & 788, 3500 &
\begin{tabular}{c} Comparison of SAR measurement \\ procedure results with numerical \\ simulations \\ \end{tabular} \\ \hline
[23] & Adult & Whole body & 98 to 2450 & Location-based exposure assessment \\ \hline
[24] & Adult & Head/torso & 850, 900, 2100, 2600,
\begin{tabular}{c} SAR values in different human tissues by \\ varying source-to-antenna distance and \\ radiated powers \\ \end{tabular} \\ \hline
[25] & Adult/SAM & Head/brain/muscle & 900, 2500, 3500 &
\begin{tabular}{c} SAR assessment for 5G mobile phones \\ through numerical simulations \\ \end{tabular} \\ \hline
[26] & Adult phantom & Brain/eye/skin & 2300 to 2400 &
\begin{tabular}{c} SAR and thermal change analyses in case \\ of prolonged exposure to mobile phone \\ radiation \\ \end{tabular} \\ \hline
[27] & Adult & Brain/skin/fat/bone & 900 &
\begin{tabular}{c} SAR and electric field strength assessment \\ in a hospital \\ \end{tabular} \\ \hline
[28] & Adult & Head/skin/bone & 900, 1800 &
\begin{tabular}{c} SAR comparison for different antenna \\ types and services (e.g., Bluetooth, Wi-Fi) \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 1: A Summary of SAR studies presented in the literature.