Table 2 The median and range of the HU measurements of the different structures, ipsilateral and contralateral of the injection site, on the pre- and post-contrast CT images for the intravenous and intra-arterial protocols

Maxillary vein

Ipsilat.

12

63.8(34.9–90.7)

109.7(81.3–146.5)

12

62.3(43.2–97.1)

307.9(91.8–2587.6)

Contralat.

12

63.0(36.7–97.8)

104.3(67.9–151.4)

12

61.0(48.7–80.7)

112.6(66.6–241.4)

Pituitary gland

N/A

12

47.5(38.5–66.6)

78.7(58.6–100.0)^a

12

57.2(34.7–108.0)

83.8(56.5–182.2)^a

Nose septum

N/A

9

68.5(32.5–115.0)

81.9(61.9–120.9)

11

67.6(50.5–108.1)

97.3(63.2–142.4)^a

Nose mucosa

Ipsilat.

9

64.0(24.8–134.5)

83.7(23,3–142.5)^a

10

48.2(40.0–92.4)

77.7(40.9–125.5)^a

Contralat.

8

63.2(14.4–128.6)

89.8(36.3–127.3)^a

10

56.6(27.3–98.6)

86.1(30.3–148.0)^a

Parotis salivary gland

Ipsilat.

12

44.7(24.3–61.1)

62.0(37.6–97.7)^a

8

42.0(32.4–55.5)

62.9(37.2–95.6)^a

Contralat.

12

47.7(32.9–61.7)

66.3(37.8–110.5)^a

8

43.7(33.7–53.8)

65.5(32.3–93.7)^a

Cerebrum

Ipsilat.

12

40.0(30.5–55.0)

41.4(29.8–56.4)^a

12

38.2(31.4–53.8)

45.7(33.2–64.4)^a

Contralat.

12

40.5(30.2–53.0)

44.8(31.4–56.1)^a

12

38.7(30.4–67.0)

45.8(35.2–91.1)^a

Longus capitis musc.

Ipsilat.

12

46.3(19.6–59.8)

52.1(23.6–65.1)^a

8

52.2(30.7–58.9)

57.3(43.5–95.3)^a

Contralat.

12

50.8(32.9–66.4)

54.6(36.0–67.1)^a

8

51.1(35.7–57.8)

62.0(50.3–83.9)^a

Temporal musc.

Ipsilat.

12

66.5(47.7–87.7)

69.3(50.0–91.8)

12

68.4(46.9–81.7)

73.7(59.4–91.0)^a

Contralat.

12

66.1(44.6–79.6)

67.8(49.8–97.0)

12

67.3(47.3–76.6)

75.3(55.2–92.0)^a

Masseter musc.

Ipsilat.

9

79.4(50.8–125.8)

85.3(53.5–140.0)

11

85.5(55.6–98.6)

91.0(67.8–154.5)^a

Contralat.

9

79.3(55.5–128.6)

83.0(59.8–129.0)

11

84.7(52.4–105.4)

84.9(59.7–149.6)^a

Corpus vitreum

Ipsilateral

11

14.9(4.2–25.9)

15.7(8.3–25.8)

11

9.7(2.7–20.9)

11.2(3.3–24.8)

Contralat.

12

15.3(4.6–28.8)

14.8(5.6–23.4)

11

8.7(2.8–21.0)

8.5(1.5–39.8)

Brainstem

N/A

12

44.7(31.6–64.4)

48.3(33.6–67.4)^a

8

39.8(23.0–68.0)

40.0(21.5–75.2)

Tongue

N/A

9

55.7(23.2–103.2)

62.2(24.4–107.4)

11

48.4(17.8–78.4)

56.3(27.7–81.2)