Page 15 - Delaware Medical Journal - December 2015

SCIENTIFIC ARTICLE
TABLE 1: Clinical Characteristics
CHARACTERISTIC
MEAN
SD
Age (yrs)
Girls
11.94
4.50
Boys
12.80
3.66
Height (cm)
Girls
139.92
29.96
Boys
151.85
24.06
Weight (kg)
Girls
47.33
27.41
Boys
52.38
23.13
BMI
Girls
21.98
6.85
Boys
21.65
5.69
METHODS
We retrospectively reviewed all pediatric patients who underwent an extremity
CT scan at our institution in 2012. All patients 19 or younger were included in this population. Data collected included sex, age, height, weight, body mass index (BMI), joint, upper extremity position, body position, scout start, scout end, CT scan procedure, CTDlvol (mGy), dose length product (CTDLP [mGy-cm]), and diagnoses. Descriptive and frequency statistics were used to show relationships between demographics, CT procedures, and radiation dose. SPSS v. 22 (IBM, Armonk, NY, USA) was used for statistical analysis.
RESULTS
A total of 163 patients met the inclusion criteria for this study. The patient population was 60.1 percent male (n = 98) and 39.8 percent female (n = 65). The age range was 0.5-19 years in females and 3.1-19 years in males (average ages: female, 11.94 ± 4.5 years; male, 12.80 ± 3.66 years). Height was 151.85 ± 24.06 cm for males and 139.92 ± 29.96 cm for females. Weight was 52.38 ± 23.13 kg for males and 47.33 ± 27.41 kg for females. BMI was 21.65 ± 5.69 for males and 21.98 ± 6.85 for females.
Lower extremity scans were more frequent (120/163, 74 percent). The three most common joints of 11 scanned were foot (37, 22.2 percent), hip (32, 19.2 percent), and ankle (25, 15.0 percent).
Upper extermity positioning was consistent for the hand and wrist as “away from the body” and shoulder at the “side
TABLE 2: Radiation Dosages by Site
ANATOMIC LOCATION
NUMBER (FREQUENCY)
CTDI vol.
CT DLP
Lower extremity
121 (74.2%)
Foot
37 (22.6%)
1.9 ± 0.6
29.0 ± 9.1
Ankle
25 (15.3%)
1.47 ± 0.3
27.1 ± 9.9
Tibia and fibula
5 (3.0%)
2.5 ± 2.5
147.5 ± 248.2
Knee
14 (8.5%)
1.7 ± 0.6
28.5 ± 15.8
Femur
8 (4.9%)
5.0 ± 2.7
168.6 ± 162.1
Hip
32 (19.6%)
7.1 ± 2.9
145.2 ± 72.4
Upper extremity
42 (25.7%)
Hand
4 (2.4%)
3.2 ± 0
57.9 ± 29.1
Wrist
12 (7.3%)
3.2 ± 0
37.0 ± 5.1
Elbow
14 (8.5%)
7.0 ± 3.3
104.7 ± 56.3
Shoulder
11 (6.7%)
5.9 ± 2.0
109.3 ± 54.0
Del Med J | December 2015 | Vol. 87 | No. 12 367