dcm2image: 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/lib/cmtk/bin/dcm2image - from package: cmtk

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

Error in other languages:
dcm2image: bevel nie gevind nie
dcm2image: comandă negăsită
dcm2image: comando não encontrado
dcm2image: commande introuvable
dcm2image: command not found
dcm2image: käsku ei ole
dcm2image: không tìm thấy lệnh
dcm2image: komanda nerasta
dcm2image: Kommando nicht gefunden.
dcm2image: kommandot finns inte
dcm2image: komut yok
dcm2image: nie znaleziono polecenia
dcm2image: níor aimsíodh an t-ordú
dcm2image: no se encontró la orden
dcm2image: no s'ha trobat l'ordre
dcm2image: opdracht niet gevonden
dcm2image: parancs nem található
dcm2image: perintah tidak ditemukan
dcm2image: príkaz nenájdený
dcm2image: příkaz nenalezen
dcm2image: команда не найдена
dcm2image: командата не е открита
dcm2image: 命令找不到
dcm2image: コマンドが見つかりません