ðə tˌiːpˌiːˈɛs ɐlˈaʊz ɐ mˈæksɪməm ʌv fˈoːɹ ʃˈiːldɪŋ blˈɑːks pɜː fˈiːld təbi tˈeɪkən ˌɪntʊ ɐkˈaʊnt wɛn kˈælkjʊlˌeɪɾɪŋ tɹˈiːtmənt tˈaɪmz ænd dˈoʊs dˌɪstɹɪbjˈuːʃənz.
The TPS allows a maximum of four shielding blocks per field to be taken into account when calculating treatment times and dose distributions.