J Clin Med Res

Journal of Clinical Medicine Research, ISSN 1918-3003 print, 1918-3011 online, Open Access

Article copyright, the authors; Journal compilation copyright, J Clin Med Res and Elmer Press Inc

Journal website http://www.jocmr.org

Original Article

Volume 9, Number 2, February 2017, pages 124-129

Evaluation of Radiation Dose Received by Premature Neonates Admitted to Neonatal Intensive Care Unit

Figure 1. Comparison between mean ESD (mSv) in different infant’s body organs. T1: thyroid of first newborn; Ch1: chest of first new born; G1: gonad of first newborn; T2: thyroid of second newborn; G2: gonad of second newborn. *Comparison of ESD between T1 and T2 (P < 0.001). **Comparison of ESD between G1 and G2 (P < 0.001).

Figure 2. Comparison between mean ESD (mSv) in different organs (chest, gonad, and thyroid) of first newborn according to newborn’s weight groups (less than 1,500 g, between 1,500 and 2,500 g and more than 2,500 g). The average received dose by all three organs reduced by increasing the infant’s weight.

**Table 1.** Demographic and Mean Received Dose by Different Organs in Study’s Premature
Variable	Mean ± SD or n (%)	Min. - Max.
T1: thyroid of first newborn; Ch1: chest of first new born; G1: gonad of first newborn; T2: thyroid of second newborn; G2: gonad of second newborn.
Male	34 (29.3)	-
Female	82 (70.7)	-
Gestational age (weeks)	31.9 ± 2.3	26.0 - 36.0
Newborn’s weight (g)	1950.78 ± 484.9	800 - 3100
Newborn’s height (cm)	43.60 ± 3.7	34 - 50
Number of graphs
1	58 (50.0)	-
2	54 (46.6)	-
3	4 (3.4)	-
Distance between TLD and radiography film (cm)	5.28 ± 0.43	3.5 - 6.0
Voltage (kVp)	41.60 ± 1.7	34 - 48
Distance (cm)	98.36 ± 2.53	90 - 100
T1 (mSv)	0.06 ± 0.01	0.000 - 0.084
Ch1 (mSv)	0.08 ± 0.01	0.046 - 0.111
G1(mSv)	0.05 ± 0.01	0.016 - 0.07
T2 (mSv)	0.003 ± 0.001	0.002 - 0.007
G2 (mSv)	0.002 ± 0.0009	0.005 - 0.01

Table 1. Demographic and Mean Received Dose by Different Organs in Study’s Premature

Variable

Mean ± SD or n (%)

Min. - Max.

T1: thyroid of first newborn; Ch1: chest of first new born; G1: gonad of first newborn; T2: thyroid of second newborn; G2: gonad of second newborn.

Male

34 (29.3)

Female

82 (70.7)

Gestational age (weeks)

31.9 ± 2.3

26.0 - 36.0

Newborn’s weight (g)

1950.78 ± 484.9

800 - 3100

Newborn’s height (cm)

43.60 ± 3.7

34 - 50

Number of graphs

58 (50.0)

54 (46.6)

4 (3.4)

Distance between TLD and radiography film (cm)

5.28 ± 0.43

3.5 - 6.0

Voltage (kVp)

41.60 ± 1.7

34 - 48

Distance (cm)

98.36 ± 2.53

90 - 100

T1 (mSv)

0.06 ± 0.01

0.000 - 0.084

Ch1 (mSv)

0.08 ± 0.01

0.046 - 0.111

G1(mSv)

0.05 ± 0.01

0.016 - 0.07

T2 (mSv)

0.003 ± 0.001

0.002 - 0.007

G2 (mSv)

0.002 ± 0.0009

0.005 - 0.01

**Table 2.** The Pearson’s Correlation Between the Variables of the Pregnancy Age at Birth and Baby’s Weight With the Amount of Radiation Dose Received in Premature Infants Under Study
Variable	T1	Ch1	G1	T2	G2
T1: thyroid of first newborn; Ch1: chest of first new born; G1: gonad of first newborn; T2: thyroid of second newborn; G2: gonad of second newborn.
Gestational age
r	-0.200	-0.424	-0.623	-0.108	-0.196
P-value	0.032	< 0.001	< 0.001	0.247	0.035
Newborn’s weight
r	-0.209	-0.361	0.573	-0.101	-0.135
P-value	0.024	< 0.001	< 0.001	0.279	0.149

Table 2. The Pearson’s Correlation Between the Variables of the Pregnancy Age at Birth and Baby’s Weight With the Amount of Radiation Dose Received in Premature Infants Under Study

Variable

Ch1

T1: thyroid of first newborn; Ch1: chest of first new born; G1: gonad of first newborn; T2: thyroid of second newborn; G2: gonad of second newborn.

Gestational age

-0.200

-0.424

-0.623

-0.108

-0.196

P-value

0.032

< 0.001

0.247

0.035

Newborn’s weight

-0.209

-0.361

0.573

-0.101

-0.135

P-value

0.024

< 0.001

0.279

0.149

**Table 3.** The Correlation Between Received Dose by T1, Ch1 and G1 With Variables of Gestational Age and Newborn Weight at the Birth Demonstrated by Linear Regression Model
	Unstandardized coefficients	Standardized coefficients beta	t	P-value
T1: thyroid of first newborn; Ch1: chest of first newborn; G1: gonad of first newborn; T2: thyroid of second newborn; G2: gonad of second newborn.
T1
Constant	0.148	0.023	-	6.490	< 0.001
Gestational age	-0.003	0.001	-0.544	-2.695	0.008
Newborn’s weight	-3.638 × 10^-7	0.000	-0.016	-0.078	0.938
Ch1
Constant	0.16	0.024	-	6.581	< 0.001
Gestational age	-0.003	0.001	-0.605	-2.765	0.007
Newborn’s weight	4.462 × 10^-6	0.000	0.197	0.899	0.371
G1
Constant	0.148	0.022	-	6.644	< 0.001
Gestational age	-0.003	0.001	-0.629	-3.319	0.001
Newborn’s weight	1.783 × 10^-7	0.000	0.007	0.039	0.969

Table 3. The Correlation Between Received Dose by T1, Ch1 and G1 With Variables of Gestational Age and Newborn Weight at the Birth Demonstrated by Linear Regression Model

Unstandardized coefficients

Standardized coefficients beta

P-value

Std. Error

T1: thyroid of first newborn; Ch1: chest of first newborn; G1: gonad of first newborn; T2: thyroid of second newborn; G2: gonad of second newborn.

Constant

0.148

0.023

6.490

< 0.001

Gestational age

-0.003

0.001

-0.544

-2.695

0.008

Newborn’s weight

-3.638 × 10^-7

0.000

-0.016

-0.078

0.938

Ch1

Constant

0.16

0.024

6.581

< 0.001

Gestational age

-0.003

0.001

-0.605

-2.765

0.007

Newborn’s weight

4.462 × 10^-6

0.000

0.197

0.899

0.371

Constant

0.148

0.022

6.644

< 0.001

Gestational age

-0.003

0.001

-0.629

-3.319

0.001

Newborn’s weight

1.783 × 10^-7

0.000

0.007

0.039

0.969