dcmqrti: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/dcmqrti - from package: dcmtk

You may install the required package with command apt-get install {package}

Error in other languages:
dcmqrti: bevel nie gevind nie
dcmqrti: comandă negăsită
dcmqrti: comando não encontrado
dcmqrti: commande introuvable
dcmqrti: command not found
dcmqrti: käsku ei ole
dcmqrti: không tìm thấy lệnh
dcmqrti: komanda nerasta
dcmqrti: Kommando nicht gefunden.
dcmqrti: kommandot finns inte
dcmqrti: komut yok
dcmqrti: nie znaleziono polecenia
dcmqrti: níor aimsíodh an t-ordú
dcmqrti: no se encontró la orden
dcmqrti: no s'ha trobat l'ordre
dcmqrti: opdracht niet gevonden
dcmqrti: parancs nem található
dcmqrti: perintah tidak ditemukan
dcmqrti: príkaz nenájdený
dcmqrti: příkaz nenalezen
dcmqrti: команда не найдена
dcmqrti: командата не е открита
dcmqrti: 命令找不到
dcmqrti: コマンドが見つかりません