28772
The MR relaxivities of the Gd - PSQ particles are determined using a 3T MR scanner , with r1 values ranging from 5 . 9 to 17 . 8 mMs ( - 1 ) on a per - Gd basis .
 Chemical: Gd - PSQ; Chemical: Gd
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Gd - PSQ; Chemical: Gd