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International Journal of Bioprinting 3D bioprinting of boluses for radiotherapy

Figure 2. Effect of alginate and protocatechuic acid on the structural properties of freeze-dried hydrogels. (A) Scanning electron microscopy (SEM)
images. (B) Fourier-transform infrared spectroscopy (FTIR) image. Abbreviations: ALG, alginate; PA, protocatechuic acid; PAM, polyacrylamide.

Figure 3. Photoresponse performance. (A) Photocuring time for different hydrogels. (B) Viscosity of different hydrogels. (C) Rheological testing results
for different hydrogels.

a significant role in enhancing the printing resolution of To ensure precise printing and prevent excessive
the gel [32,33] . After being added to the gel, Tar retains its crosslinking, the photopolymer should possess low
photoresponsive characteristics that could still satisfy the viscosity and fluidity [34,35] . Figure 3B displays the varying
fundamental requirements of DLP printing. viscosities of different gels, with all solutions exhibiting

Volume 10 Issue 2 (2024) 255 doi: 10.36922/ijb.1589